Trigonometric Functions
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Transcript of Trigonometric Functions
4.1
Trigonometry means "the measurement of angles"
initial side starting point of a ray
terminal side the position after the rotation
vertex the endpoint of the initial and terminal sides
standard position when the initial side is on the xaxis between quadrants I and IV, the vertex is on the origin, and the terminal side moves counterclockwise
positive angles generated by a counterclockwise rotation
negative angle generated by a clockwise rotation
Coterminal angles a positive and negative angle that have the same initial side and terminal side
initial side
terminal side
vertex
initial side
terminal side
vertex
initial side
terminal side
vertex
initial side
terminal side
vertex
initial side
terminal side
vertex
4.1
Angles are labeled with Greek letters:• alpha• beta• theta
Angles can also be labeled with uppercase letters:• A• B• C
The measure of an angle is determined by the amount of rotation from the initial side to the terminal side. In calculus, it's usually measured in radians (rad).
Definition of a Radian:• One radian (rad) is the measure of a central
angle theta ( ) that intercepts an arc (s) equal in length to the radius (r) of the circle.
• =
central angle the vertex is the center of the circle
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4.1 Radian and Degree Measure Name___________________________________©l _2z0g1Z9J nKru[tyak zSoorfntgw^aurYei AL]LBCu.] R ZARlTlB \rYiGgahGtHsR Erhe[sEeirQv`eIdv.
-1-
State the quadrant in which the terminal side of each angle lies.
1) 11p
62) -
5p
6
3) 5p
34)
13p
6
5) -47p
126)
23p
6
7) 17p
68)
8p
3
9) -17p
1810) -
71p
18
Draw an angle with the given measure in standard position.
11) 11p
9
x
y
12) -2p
9
x
y
13) -5p
3
x
y
14) -13p
18
x
y
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-2-
15) -23p
6
x
y
16) -13p
4
x
y
17) 7p
4
x
y
18) -11p
3
x
y
19) 8p
3
x
y
20) p
4
x
y
State the quadrant in which the terminal side of each angle lies.
21) -115° 22) -400°
23) 206° 24) 651°
25) -380° 26) -310°
27) -340° 28) 305°
29) -263° 30) 590°
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-3-
Draw an angle with the given measure in standard position.
31) 530°
x
y
32) -440°
x
y
33) -215°
x
y
34) -50°
x
y
35) 495°
x
y
36) -230°
x
y
37) -10°
x
y
38) -400°
x
y
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-4-
39) 50°
x
y
40) -190°
x
y
Find a positive and a negative coterminal angle for each given angle.
41) 170° 42) -210°
43) -625° 44) -2°
45) -260° 46) 420°
47) 120° 48) -285°
49) 160° 50) -306°
Convert each degree measure into radians.
51) -10° 52) -510°
53) 50° 54) -140°
55) 120° 56) -675°
57) -750° 58) -165°
59) -120° 60) -20°
Convert each radian measure into degrees.
61) -25p
1862)
3p
2
63) -19p
964) -
19p
6
65) -5p
1866) -
53p
36
67) 3p
468) -
8p
9
69) -p
470) -
5p
3
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-5-
Find the measure of each angle.
71)
x
yp
6
72)
x
y
p
4
73)
x
y
4p
9
74)
x
y
p
4
75)
x
y
5p
12
76)
x
y
p
3
77)
x
y
11p
12
78)
x
y
p
3
79)
x
y
p
6
80)
x
y
4p
9
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-6-
Convert each degrees-minutes-seconds into decimal degrees.
81) 85° 42' 18" 82) 50° 2' 15"
83) 139° 9' 0" 84) 214° 35' 42"
85) 252° 39' 54" 86) 69° 53' 33"
87) 253° 24' 36" 88) 328° 10' 57"
89) 275° 25' 3" 90) 205° 4' 30"Convert each decimal degree measure into degrees-minutes-seconds.
91) 279.8575° 92) 274.3275°
93) 209.185° 94) 274.935°
95) 190.7325° 96) 264.44°
97) 99.9075° 98) 135.3225°
99) 155.605° 100) 5.3875°Find the length of each arc.
101)
7 mi3p
4
102)
4 inp
2
103)
14 in
5p
3
104)
6 in7p
12
105)
17 ft
5p
4
106)
13 m
3p
2
107)
6 yd
5p
4
108)
18 in
p
2
109)
5 ydp
4
110)
15 yd2p
3
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Pre-Calculus
Practice Quiz: 4.1 Radian and Degree Measure
Name___________________________________
Period____ Mailbox # ______©f M2s0S1Z9Q kKXuMtYay xSfoAfht`waaFrMeu TLPLCCi.z F OAqlDlB zrdiugkhptRsK JrWersFekrQvkeSdg.
-1-
State the quadrant in which the terminal side of each angle lies.
1) 11p
32) -
13p
4
3) -447° 4) 547°Draw an angle with the given measure in standard position.
5) -13p
4
x
y
6) 9p
4
x
y
7) 600°
x
y
8) -660°
x
y
Find a positive and a negative coterminal angle for each given angle.
9) 285° 10) -225°
11) -25p
1812)
7p
3
Convert each degree measure into radians.
13) -780° 14) 345°
15) 150° 16) -250°
Convert each radian measure into degrees.
17) 5p
618) -
31p
6
19) 7p
420) -
7p
6
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-2-
Find the measure of each angle.
21)
x
y
p
9
22)
x
y
4p
9
23)
x
y
4p
9
24)
x
y
p
3
Convert each degrees-minutes-seconds into decimal degrees.
25) 247° 55' 48" 26) 206° 48' 0"
27) 72° 12' 54" 28) 338° 55' 12"
Convert each decimal degree measure into degrees-minutes-seconds.
29) 227.4525° 30) 118.775°
31) 63.8375° 32) 83.6125°
Find the length of each arc.
33)
13 m
2p
3
34)
13 in
7p
4
35)
7 cm
17p
12
36)
12 ft
3p
4
4.2 The Unit Circle
Sine sin t = y Cosecant csc t = 1/yy ≠ 0
Cosine cos t = x Secant sec t = 1/xx ≠ 0
Tangent tan t = y/x Cotangent cot t = x/yx ≠ 0 y ≠ 0
Let t be a real number and let (x,y) be the point on the unit circle corresponding to t.
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Pre-Calculus CP
4.2 Trig. Functions: The Unit Circle
Name___________________________________
Date________________ Period____ Mailbox # ______©P s2r0z1S9H yK`uUtYa^ BSZoYfLt`wZafrne] ULVLnC_.q c UAXlsl` brpi^gFhxtpsM crteXsgekrnv`eDdh.
-1-
1) Definitions of trig functions: 2) Sketch the unit circle.
3) Definition of a periodic function: 4) Even and odd trig functions:
Find the point (x, y) on the unit circle that corresponds to the real number t.
5) t = p
46) t =
p
3
7) t = 7p
68) t =
5p
4
9) t = 2p
310) t =
5p
3
11) t = -7p
412) t = -
4p
3
13) t = 3p
2
14) t = p
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-2-
Evaluate the sine, cosine, and tangent of the real number.
15) t = p
416) t =
p
3
17) t = -7p
418) t = -
5p
4
19) t = 2p
320) t =
5p
3
21) t = -5p
322) t =
11p
6
23) t = -p
624) t = -
p
4
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-3-
Find the value of each. Round your answers to the nearest ten-thousandth.
25) sin 4p
926) sin
p
10
27) sin p
2028) sin
5p
18
29) sin 2p
930) cos
p
60
31) cos p
632) cos
2p
9
33) cos p
334) cos
p
20
35) tan 11p
3636) tan
4p
9
37) tan 3p
2038) tan
p
6
39) tan p
1540) csc
5p
12
41) csc p
442) csc
7p
18
43) csc p
644) csc
p
9
45) sec 3p
2046) sec
4p
9
47) sec 2p
4548) sec
17p
36
49) sec 7p
1850) sec
p
6
51) cot p
652) cot
2p
9
53) cot 5p
3654) cot
3p
10
55) cot p
956) cot
p
3
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-4-
Evaluate the trigonometric function using its period as an aid.
57) sin 5p 58) cos 5p
59) cos8p
360) sin
9p
4
61) cos -13p
662) sin -
19p
6
63) sin -9p
464) cos -
8p
3
Evaluate the six trigonometric functions of the real number.
65) t = 3p
466) t =
5p
6
67) t = p
268) t =
3p
2
69) t = -4p
370) t =
7p
4
4.3 Right Triange Trig
hypote
nuse
hypote
nuse
adjacent
adjacent
opposite
opposite
Pythagorean theorem
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4.3 Right Triangle Trigonometry Name ___________________________________©H q2k0Y1b9i zKYubtuaK tSzoWfxtHwlaZrWer ]LgLzC[.Y m LAplslP urxizgphJtJsu ^r\edsLeIrZv[eJdH.
-1-
Find the value of each. Round your answers to the nearest ten-thousandth.
1) sin 60° 2) sin 10°
3) sin 11° 4) sin 85°
5) csc 10° 6) csc 40°
7) csc 80° 8) csc 30°
9) cos 20° 10) cos 60°
11) cos 18° 12) cos 70°
13) sec 24° 14) sec 26°
15) sec 34° 16) sec 80°
17) tan 5° 18) tan 37°
19) tan 67° 20) tan 10°
21) cot 30° 22) cot 27°
23) cot 55° 24) cot 40°
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-2-
Find the value of the trig function indicated.
25) Find sin q if cos q = 15
1726) Find cot q if tan q =
3
4
27) Find cos q if cot q = 15
828) Find tan q if sin q =
5
5
29) Find sec q if csc q = 17
430) Find tan q if csc q =
5
4
31) Find csc q if sin q = 7
432) Find tan q if sec q =
5
3
33) Find tan q if cot q = 134) Find sec q if cos q =
11 5
25
35) Find sin q if cos q = 11
1636) Find sec q if sin q =
4
5
37) Find csc q if sin q = 7
2538) Find cot q if tan q =
4
3
39) Find tan q if cot q = 5
240) Find cot q if cos q =
7
25
41) sin q
8
15
q
42) sin q
1715
q
43) sin q
6 512
q44) sin q
11
4 6
q
45) csc q25
24
q
46) csc q
2110
q
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-3-
47) csc q
5
3
q
48) csc q
15
12
q
49) cos q
23
22
q
50) cos q16
12
q
51) cos q13
2
q
52) cos q
8 24
q
53) sec q
14 14
q54) sec q
10
6
q
55) sec q25
15
q
56) sec q25
7q
57) tan q
186
q58) tan q
10
8
q
59) tan q
15
9
q
60) tan q
23
8 7
q
61) cot q7
24
q
62) cot q5
4
q
63) cot q
135
q
64) cot q
178
q
4.4 Trig Functions of Any Angle
Reference Angles:
Let theta ( ) be an angle in standard position. Its reference angle is formed by the terminal side of and the horizontal axis.
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Pre-Calculus
4.4 Trigonometric Functions of Any Angle
Name ___________________________________
Period ____ Mailbox # ______©o F2a0_1Q9J rK[ultSaD LS^onf[tcwmaPrFeJ ^LCLpCs.c t wAllOl[ LrOizgOhPtdsp crReRspeNrpvleQdt.
-1-
Use the given point on the terminal side of angle qq to find the value of the trigonometricfunction indicated.
1) sin q
x
y
(-16, -8)
2) sin q
x
y
(-15, -8)
3) sin q ; (-14, 7) 4) sin q ; (9, -12)5) csc q
x
y
(-4, -2 5)
6) csc q
x
y
( 5 , 2)
7) csc q ; (-18, -6) 8) csc q ; ( 17 , 8)9) cos q
x
y
(-4, 3)
10) cos q
x
y
(5, 11)
11) cos q ; (-6, -9) 12) cos q ; (8, 17)13) sec q
x
y
(-3, 3)
14) sec q
x
y
(-2, -2 3)
15) sec q ; (3, -4) 16) sec q ; (-2, -2 3)
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-2-
17) tan q
x
y
(3, - 7)
18) tan q
x
y
(4, 3)
19) tan q ; ( 7 , 3) 20) tan q ; (2 5 , 4)
21) cot q
x
y
(14, 16)
22) cot q
x
y
(-2 5 , 4)
23) cot q ; (16, -4) 24) cot q ; (3, -6)
Find the reference angle.
25) -580° 26) 330°
27) -535° 28) 300°
29) 475° 30) 195°
31) 47p
1832) -
20p
9
33) -19p
1834)
20p
9
35) -25p
936) -
5p
4
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PRACTICE TEST: 4.1 to 4.4 Name___________________________________©] H2h0q1a9` AKsuttrar BScoufetTwfagrveM [LlLKCm.D q ZAWllly frbiRgfhPtWsE hrHeksCedrVvMe_dZ.
-1-
State the quadrant in which the terminal side of each angle lies.
1) 20p
9
A) II B) IC) IV D) III
2) 505°A) III B) IIC) IV D) I
Draw an angle with the given measure in standard position.
3) 11p
3
A)
x
y
B)
x
y
C)
x
y
D)
x
y
4) -370°A)
x
y
B)
x
y
C)
x
y
D)
x
y
Find a positive and a negative coterminal angle for each given angle.
5) 120°
A) 480° and -240°B) 660° and -150°C) 390° and -60°D) 480° and -60°
6) -7p
6
A) p
3 and -
11p
3
B) 4p
3 and -
13p
6
C) p
3 and -
8p
3
D) 5p
6 and -
19p
6
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-2-
Convert each degree measure into radians.
7) -840°
A) -169p
36B) -
83p
18
C) -85p
18D) -
14p
3
8) 890°
A) 89p
18B) 5p
C) 95p
9D)
89p
9
Convert each radian measure into degrees.
9) 4p
3
A) 240° B) 230°C) 275° D) 195°
10) 11p
3
A) 710° B) 550°C) 1250° D) 660°
Find the measure of each angle.
11)
x
y
2p
9
A) 29p
36B)
2p
9
C) 31p
18D)
7p
9
12)
x
y
5p
12
A) 41p
12B)
43p
12
C) 47p
12D)
29p
12
Convert each degrees-minutes-seconds into decimal degrees.
13) 294° 13' 3"
A) 294.6775° B) 294.2175°C) 294.155° D) 294.455°
14) 70° 44' 33"
A) 70.825° B) 70.41°C) 70.7425° D) 70.44°
Convert each decimal degree measure into degrees-minutes-seconds.
15) 246.4825°
A) 246° 18' 36"B) 246° 28' 57"C) 246° 45' 18"D) 246° 39' 9"
16) 134.0025°
A) 134° 1' 3" B) 134° 1' 21"C) 134° 0' 9" D) 134° 0' 27"
Find the point (x, y) on the unit circle that corresponds to the real number t.
17) t = p
418) t =
3p
2
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-3-
Find the length of each arc.
19)
14 m
3p
2
A) 28p m B) 392p
3 m
C) 196p m D) 21p m
20)
9 ft
7p
4
A) 11p
6 ft B) 25515p ft
C) 63p
4 ft D)
567p
8 ft
Find the value of each. Round your answers to the nearest ten-thousandth.
21) sin 11p
60
A) 0.6494 B) 0.5446C) 1.8361 D) 1.5399
22) cos p
36
A) 0.0872 B) 1.0038C) 0.9962 D) 11.4737
23) tan 4p
9
A) 0.9848 B) 5.6713C) 5.7588 D) 0.1763
24) csc 13p
180
A) 4.4454 B) 0.2309C) 1.0263 D) 0.2250
25) sec 17p
36
A) 0.9962 B) 0.0875C) 1.0724 D) 11.4737
26) cot 5p
36
A) 2.1445 B) 0.4663C) 1.1034 D) 0.9063
Evaluate the trigonometric function using its period as an aid.
27) sin9p
428) cos -
8p
3
Evaluate the six trigonometric functions of the real number.
29) t = 3p
230) t = -
4p
3
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Worksheet by Kuta Software LLC
-4-
Find the value of each. Round your answers to the nearest ten-thousandth.
31) sin 50°A) 0.6428 B) 0.7660C) 0.6494 D) 1.1918
32) csc 40°A) 1.3054 B) 0.6428C) 1.5557 D) 1.1918
33) cos 56°A) 1.2062 B) 0.8290C) 1.4826 D) 0.5592
34) sec 75°A) 0.9659 B) 0.2679C) 3.8637 D) 0.2588
35) tan 70°A) 2.7475 B) 2.9238C) 0.3640 D) 0.9397
36) cot 40°A) 1.1918 B) 1.5557C) 0.7660 D) 0.8391
Find the value of the trig function indicated.
37) Find csc q if tan q = 21
2
A) 2 21
21B)
5 21
21
C) 2 6
7D)
21
5
38) Find csc q if cos q = 4
5
A) 4
5B)
3
4
C) 5
4D)
5
3
39) csc q15
8
q
A) 5
4B)
17
15
C) 13
12D)
8
17
40) cos q13
5q
A) 5
13B)
13
12
C) 12
5D)
13
5
41) sec q15
3 21
q
A) 5 21
21B)
2 21
21
C) 2
5D)
23
22
42) cot q
2 106
q
A) 1
3B) 10
C) 10
10D)
3 10
10
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Worksheet by Kuta Software LLC
-5-
Use the given point on the terminal side of angle qq to find the value of the trigonometric functionindicated.
43) sin q
x
y
( 13 , -6)
A) 7 13
13B)
13
7
C) -6
7D) -
6 13
13
44) csc q
x
y
(-9, 19)
A) -9 19
19B) -
10
9
C) -19
9D)
10 19
19
45) cos q ; (-4, 3)
A) 3
5B)
5
3
C) -4
5D) -
4
3
46) sec q ; ( 11 , 5)
A) 11
6B)
5 11
11
C) 6 11
11D)
2
2
47) tan q ; (6, 13)
A) 7 13
13B)
6
7
C) 13
6D)
13
7
48) cot q ; (20, -8)
A) 29
5B)
5 29
29
C) -2
5D) -
5
2
Find the reference angle.
49) -110°
A) 70° B) 45°C) 20° D) 75°
50) 49p
18
A) 7p
36B)
p
4
C) 5p
18D)
2p
9You're almost done! :)
51) Draw and label the hexagon for the trig.identities.
52) List the Pythagorean Identities.
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Worksheet by Kuta Software LLC
-6-
Answers to PRACTICE TEST: 4.1 to 4.4
1) B 2) B 3) A 4) A5) A 6) D 7) D 8) A9) A 10) D 11) D 12) B13) B 14) C 15) B 16) C
17) ( 2
2,
2
2 ) 18) (0, -1) 19) D 20) C
21) B 22) C 23) B 24) A25) D 26) A
27) 2
228) -
1
2
29) sin3p
2 = -1 csc
3p
2 = -1
cos3p
2 = 0 sec
3p
2 is undefined
tan3p
2 is undefined cot
3p
2 = 0
30) sin -4p
3 =
3
2 csc -
4p
3 =
2 3
3
cos -4p
3 = -
1
2 sec -
4p
3 = -2
tan -4p
3 = - 3 cot -
4p
3 = -
3
3
31) B 32) C 33) D 34) C35) A 36) A 37) B 38) D39) B 40) A 41) A 42) A43) C 44) D 45) C 46) C47) C 48) D 49) A 50) C51) 52)
BONUS ASSIGNMENT: My Picture Contains a Unit Circle Project
Here is a chance for you to be creative with the unit circle and get a good, easy test grade, if you just put forth
some effort!
First, think of a round object: a pie, a car tire, a plate, etc. I tried not to give you too many ideas, so that you
have more room to be creative. I usually find that students are more creative than I am anyway!
Draw and color a picture that contains this round object on an 8 ½ x 11 sheet of white copy paper. The entire
picture does not have to be the circle, but within the picture, the circle has to be large enough to label. Here are
some things you will want to use:
o Compass for drawing the circle.
o Protractor for measuring the angles of the unit circle.
o Colored pencils, markers, and crayons for coloring your picture.
FYI: If you are not the best artist, choose something easier to draw and color; if you are a good artist, you can
draw something more intricate.
Label the circle in your picture with the 82 parts of the unit circle shown to you in class. This includes 0, 2∏,
0°, 360°, but only one (cos, sin) and tan for that angle. (You do not have to do this from memory…you can use
your unit circle, your textbook, or the Internet.)
Write your name (first and last) and class period on the back of your paper.
Rubric
o All 82 parts of the labeled unit circle are correct 50 points (all or nothing)
o Circle drawn with compass/Angles measured with protractor 25 points
o Uniqueness/creativity of the circle in your picture 10 points (very subjective)
o First and last names and period on the back 10 points (all or nothing)
o “Prettiness” factor (How nicely is it colored?) 5 points (very subjective)
Example: Years ago, someone drew a bicycle like this and then labeled the large
tire with the values of the unit circle. (Of course, it was in color, but I can’t do
that for your paper!) Assuming it was colored, the values on the circle were
correct, and the person’s name and period were on the back, this would definitely
be a 100.
Please turn this assignment in to Ms. Lambert (if you choose to complete it for a
bonus grade) by the beginning of your class period on ____________ at the latest.
Happy Drawing!
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Worksheet by Kuta Software LLC
Pre-Calculus
4.5: Graphing Cosine Functions - 1
Name ___________________________________
Period ____ Mailbox # ______©n A2v0B1z9t EKbuRtiax bSzoEf`tWwtamrMeG DL_LlCK.u t eAxlAlh HrYiOgGh^tYsM MrweuszeFrSv[etd\.
-1-
Find the amplitude and period of each function. Then graph. We'll do the first ten questions together.
1) y = cos q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
2) y = cos q
90° 180° 270° 360° 450° 540°
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
Amplitude Change
3) y = 2cos q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
4) y = 1
2 × cos q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
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Worksheet by Kuta Software LLC
-2-
Period Change
5) y = cos 2q
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
6) y = cosq
2
p 2p 3p 4p 5p 6p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
Vertical Shift
7) y = cos q + 2
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
8) y = cos q - 2
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
Phase Shift
9) y = cos (q + p
2 )
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
10) y = cos (q - p
2 )
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
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Worksheet by Kuta Software LLC
-3-
YOUR TURNUsing radians, find the amplitude and period of each function. Then graph. Amplitude Change
11) y = 3cos q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
12) y = 4cos q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
Period Change
13) y = cosq
4
p 2p 3p 4p 5p 6p 7p 8p 9p 10p11p12p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
14) y = cosq
3
p 2p 3p 4p 5p 6p 7p 8p 9p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
15) y = cos 4q
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
16) y = cos 3q
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
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Worksheet by Kuta Software LLC
-4-
Vertical Shift
17) y = cos q + 1
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
18) y = cos q - 1
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
Phase Shift
19) y = cos (q + 3p
2 )
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
20) y = cos (q - p
3 )
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
21) y = cos (q + p
4 )
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
22) y = cos (q - 3p
4 )
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
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Worksheet by Kuta Software LLC
Pre-Calculus
4.5: Graphing Cosine Functions - 2
Name ___________________________________
Period ____ Mailbox # ______©M y2W0C1Z9K FKpuctta_ mSQoWf[tlwDaRrZeS gLLLdCw.H o pAHlqlA nrki_gDh\tusd pryeLsveWrIvCe`dJ.
-1-
Using radians, find the amplitude and period of each function. Then graph.
1) y = cos (2q + p
6 ) - 1
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
2) y = 1
2 × cos 4q + 1
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
3) y = 3cos (q - p
4 ) + 2
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
4) y = -1 + 4cos q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
5) y = cos (q - 3p
4 ) - 1
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
6) y = 2cos (q - 2p
3 ) - 1
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
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Worksheet by Kuta Software LLC
-2-
7) y = 2cosq
2 - 1
p 2p 3p 4p 5p 6p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
8) y = 1
2 × cos 2q - 2
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
9) y = 2cos (2q + 2p
3 ) + 2
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
10) y = 2 + 4cos (q + 7p
6 )
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
11) y = 3cos (q - p
2 ) + 2
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
12) y = 2cos (3q + p
6 ) + 2
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
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Worksheet by Kuta Software LLC
Pre-Calculus
4.5: Graphing Sine Functions - 1
Name ___________________________________
Period ____ Mailbox # ______©h O2Q0I1F9O GKguMtnaE dSHoefRtJwXaDr`es `LGLYC].v h yAqlLl[ drYirgNhTtZs_ arIeps^efrJvReedc.
-1-
Find the amplitude and period of each function. Then graph. We'll do the first ten questions together.
1) y = sin q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
2) y = sin q
90° 180° 270° 360° 450° 540°
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
Amplitude Change
3) y = 2sin q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
4) y = 1
2 × sin q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
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Worksheet by Kuta Software LLC
-2-
Period Change
5) y = sin 2q
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
6) y = sinq
2
p 2p 3p 4p 5p 6p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
Vertical Shift
7) y = sin q + 2
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
8) y = sin q - 2
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
Phase Shift
9) y = sin (q + p
2 )
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
10) y = sin (q - p
2 )
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
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Worksheet by Kuta Software LLC
-3-
YOUR TURNUsing radians, find the amplitude and period of each function. Then graph. Amplitude Change
11) y = 3sin q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
12) y = 4sin q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
Period Change
13) y = sin 4q
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
14) y = sin 3q
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
15) y = sinq
4
p 2p 3p 4p 5p 6p 7p 8p 9p 10p11p12p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
16) y = sinq
3
p 2p 3p 4p 5p 6p 7p 8p 9p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
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-4-
Vertical Shift
17) y = sin q + 1
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
18) y = -1 + sin q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
Phase Shift
19) y = sin (q + 2p
3 )
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
20) y = sin (q - 3p
4 )
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
21) y = sin (q + p
4 )
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
22) y = sin (q - 5p
4 )
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
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Pre-Calculus
4.5: Graphing Sine Functions - 2
Name ___________________________________
Period ____ Mailbox # ______©g L2J0p1P9N KKauitSat XSXoJfZtowAasrJeB ELOLtCC.Y E YAAlyly erJiFgbhjtrsW ErtelsZeJrPvneXdp.
-1-
Using radians, find the amplitude and period of each function. Then graph.
1) y = sin (q - 11p
6 )
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
2) y = sin (q + 2p
3 ) + 2
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
3) y = 2sin (q
2 +
5p
6 )
p 2p 3p 4p 5p 6p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
4) y = sin (2q - p
4 ) - 1
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
5) y = sin (4q - 3p
4 )
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
6) y = 1
2 × sin 4q - 2
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
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-2-
7) y = -2 + sin q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
8) y = 3sin (2q + p
3 )
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
9) y = 2sinq
2
p 2p 3p 4p 5p 6p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
10) y = 3sin (q
4 -
3p
4 ) - 1
p 2p 3p 4p 5p 6p 7p 8p 9p 10p11p12p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
11) y = 4sin q - 2
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
12) y = 1
2 × sin 3q + 2
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
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Pre-Calculus
4.6: Graphs of Other Trigonometric Functions
Name ___________________________________
Period ____ Mailbox # ______©Y L2T0d1`9\ mKUuCtdaw ]Soo\fPtew`aWrreY mLVLoCn.Z B qAQlAlA jrDi_gghstAsV XrteFsUebrfvwe^dY.
-1-
Using radians, find the amplitude and period of each function. Then graph.
1) y = tan q
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
2) y = cot q
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
3) y = sin q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
4) y = csc q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
5) y = cos q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
6) y = sec q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
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Worksheet by Kuta Software LLC
-2-
7) y = 2tan (q - 3p
4 )
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
8) y = cot 2q - 2
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
9) y = -1 + 2sec q
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
10) y = tan 2q - 2
-p
4
p
4
p
2
3p
4
p 5p
4
3p
2
7p
4
2p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
11) y = csc (q - p
2 ) - 1
p
2
p 3p
2
2p 5p
2
3p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
12) y = secq
2
p 2p 3p 4p 5p 6p
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
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Pre-Calculus
4.7: Inverse Trigonometric Functions (day 1)
Name ___________________________________
Period ____ Mailbox # ______©G `2p0L1T9u mKIuFtIaL yS[oAfQt`wFaArtey TLJLHCW.a D pA_lClM ArKiFgXhwtssO `rIeCsXecr]vgeUdV.
-1-
Complete Page 322 #1-13 & Page 323 #17-32
1) . 2) .
3) . 4) .
5) . 6) .
7) . 8) .
9) . 10) .
11) . 12) .
13) . 14) skip this question
15) skip this question 16) skip this question
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-2-
17) . 18) .
19) . 20) .
21) . 22) .
23) . 24) .
25) . 26) .
27) . 28) .
29) . 30) .
31) . 32) .
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Pre-Calculus
4.7: Inverse Trigonometric Functions (day 2)
Name ___________________________________
Period ____ Mailbox # ______©F G2x0_1]9a sKmuxtXaf eSwogf^thwRaorPeW \L^L_Cb.m j JAtlpla VrAiWgFh[tNsC JrheZs\enrRvOetdy.
-1-
Find each angle measure to the nearest degree.
1) tan W = 0.8391 2) sin C = 0.9455
3) sin Y = 0.7431 4) tan X = 0.4452
5) tan X = 3.7321 6) tan Y = 0.9657
7) tan U = 6.3138 8) tan A = 0.7002
9) sin U = 0.6820 10) sin U = 0.6691
11) sin B = 0.7193 12) cos U = 0.2079
13) sin U = 0.9816 14) cos A = 0.5446
15) sin V = 1.0000 16) cos Y = 0.2924
17) tan W = 7.1154 18) sin U = 0.9945
19) cos B = 0.4384 20) tan W = 3.4874
21) tan B = 5.1446 22) cos B = 0.1564
Find the measure of the indicated angle to the nearest degree.
23)
4860
?
24)
46
50
?
25)
20
31
?
26)
25
46
?
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-2-
27)
1635
?
28)
9
25
?
29)
22
32
?
30)
3140
?
31)
813
?
32)
20
12
?
33)
11
12
?
34)
37
32
?
35)
38
40
?
36)
44
24
?
37)
1117
?
38)
1114
?
39)
59
?
40)
7
12
?
Modeling with Trigonometric Functions Periodic phenomena occur all the time in the physical world. For example:
Seasonal variations in our climate
Variations in average maximum and minimum monthly temperatures
The number of daylight hours at a particular location
Tidal variations in the depth of water in a harbor
The phase of the moon
Animal populations Definition: A periodic function is one which repeats itself over and over in a horizontal direction.
A periodic function’s graph oscillates about a horizontal line called the principal axis (or mean line)
The amplitude of a periodic function is the distance between a maximum (or minimum) point and the principal axis.
The period of a periodic function is the length of one repetition or cycle. Example: The general sine function is y = a sin (bx – c) + d
The value of “a” affects amplitude (height of the curve)
The value of “b” affects period
The value of c/b affects the phase shift (horizontal shift)
The value of “d” affects the principal axis (vertical shift)
Practice #1: Without using technology, sketch the graph of y = 2 cos (2x) for 0° < x < 360°. Practice #2: Use trigonometric models The height h(t) meters of the tide above mean seal level on January 24th at Cape Town is modeled approximately by h(t) = 3 sin(30t) where t is the number of hours after midnight.
a. Graph y = h(t) for 0 < t < 24 b. When is high tide? What is the maximum height? c. What is the height at 2 pm? d. If a ship can cross the harbor provided the tide is at least 2 m above mean sea level, when is crossing possible on
January 24?
Modeling with Trigonometric Functions BONUS
Throughout the day the depth of water at the end of a pier varies with the tides. High tide occurs at 4:00 a.m. with a depth of 6 meters. Low tide occurs at 10:00 a.m. with a depth of 2 meters.
1. Model the problem by using the given trigonometric equation to show the depth of the water t hours after
midnight, showing all of your work.
a. Determine the equation for the situation described above.
b. Using graph paper, graph the situation described above.
2. Solve the problem by finding the depth of water at noon, explaining your reasoning.
3. A large boat needs at least 4 meters of water to secure it at the end of the pier. Determine what time period
after noon the boat can first safely be secured, justifying your answer.