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8/19/2019 Tutorial 1.1 Solution
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PTG 0016 Trigonometry and Coordinate Geometry
Tutorial 1.1: Trigonometric Functions
1) Draw each angle.
a)
135°
b) 450°
c)
2) Convert each angle to a decimal in degrees. Round the answer to two decimal places.
a) 40° 10’ 25’’
Ans: 40.17°
b) 9° 9’ 9’’
3) Convert each angle to D°M’S’’ form. Round the answer to the nearest seconds.
a) 40.32°
Ans: 40°19’12’’
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b) 18.255°
4) Convert each angle in degrees to radians. Express the answer as a multiple of .a) 30°
Ans:
b) 180°
Ans: radians
c) -135°
5) Convert each angle in radians to degrees.
a)
Ans: 60°
b)
6) Convert each angle in degrees to radians. Express your answer in decimal form,
rounded to two decimal places.
a) -40°
Ans: -0.70 radian
b)
125°
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7) Convert each angle in radians to degrees. Express your answer in decimal form,
rounded to two decimal places.
a) 3.14
Ans: 179.91°
b)
6.32
8) Find the values of the six trigonometric functions of the angle in each figure.(a)
5
12
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(b)
(c)
1
3
2
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9) Use identities to find the exact value of each of the four remaining trigonometric
functions of the acute angle .
a) =
, =
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b) =
, =
10) Use the definition or identities to find the exact value of each of the remaining five
trigonometric functions of the acute angle .
a) =
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b) =
c) = 2
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11) Use Fundamental Identities and/or the Complementary Angle Theorem to find the
exact value of each expression. Do not use a calculator.
a) °+ °Ans: 1
b)
Ans: 1
c) -
Ans: 0
d) -
e)
f) 1 - ° - °Ans: 0
g) -
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h) . .
i)
+
12) Given =
, use trigonometric identities to find the exact value of
a) b) °c)
d)
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13) Given =
, use trigonometric identities to find the exact value of
a)
Ans:
b)
°
Ans:
c)
Ans:
d)
e) Ans:
14) Given = use trigonometric identities to find the exact value ofa) b) c)
d)
15) Given = use trigonometric identities to find the exact value of
a)
Ans:
b) Ans: 15
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c) Ans: 4
d)
Ans:
16) Given the approximation , use trigonometric identities to find theexact value of
a) b) c) d) e) f) g) h)
17) Given f () = . Find the exact value of each expression of each expression if =60. Do not use a calculator.
a)
Ans:
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b) f (
)
c) [ f ()]2
d) 2 f ()Ans:
e)
18) Find the exact value of each expression. Do not use a calculator.
a) - Ans:
b)
+
c)
– 4
d) °+ °
Ans:
19) Use a calculator to find the approximate value of each expression. Round the answer
to two decimal places.
a) =0.47 b)
= 0.38c)
= 0.31
d)
= 3.73
e) = 0.31
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20) A point on the terminal side of an angle is given. Find the exact value of each of thesix trigonometric function of
a) (-3, 4)
b) (2, -3)
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c) (
21) Use a coterminal angle to find the exact value of each expression. Do not use acalculator.
a)
Ans:
b)
22) Name the quadrant in which the angle a)
Ans: lies in quadrant II.
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b)
23) Find the reference angle of each angle.
a) -30 Ans: reference angle = 30
b) 120 Ans: reference angle = 60
c) 210
d)
Ans: reference angle =
e)
f) -135
g)
h) Ans: reference angle = 80
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i)
24) Use the reference angle to find the exact value of each expression. Do not use a
calculator.
a) Ans: -2
b) Ans:
c)
d)
Ans:
e)
f)
Ans:
g)
h)
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25) Find the exact value of each of the remaining trigonometric functions of
a) =
, Ans:
b) = ,
c)
=
, Ans:
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d) = ,
Ans:
e) = 2,
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26) Use the fact that the trigonometric functions are periodic to find the exact value of
each expression. Do not use a calculator.
a) sin405
Ans:
b)
tan405 Ans: 1
c) csc450 Ans: 1
d) cot390
e)
f)
g)
h)
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27) Use the even-odd properties to find the exact value of each expression. Do not use a
calculator.
a) sin(-60°)
Ans:
b)
tan(-30°)
Ans:
c)
Ans: -1
d)
e)
28) Find the exact value of each expression. Do not use a calculator.
a) + Ans: -1
b) +
29) Determine the amplitude and period of each function without graphing.
a) y = -sin(
)
Ans: amplitude, A = 1
Period, T = 4π
b) y = 6 sin(πx)
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c) y = -
30) Graph each function. Be sure to label key points and show at least two cycles.
a) y = 4 cos (x)
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b) y = cos(4x)
Ans:
c) y = -
cos(2x)
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d)
y = 2 sin(x) + 3
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e) y = -6
+ 4
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f) y = 5 – 3sin(2x)
Ans: