Download sec70 csc 60 tan 30 csc20 a b − − 5 61 53 2

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Topic 3: Finding the values of trigonometric functions of acute angles
1. Two sides of a right triangle ABC (C is the right angle) are given. Find the indicated
trigonometric function of the given angle (exact value).
B
(a) sin A when a = 5 and b = 6.
a
(b) sec B when a = 2 and b = 7.
2. Find the exact value of each expression.
(a) −
sec700
csc 200
(b)
A
b
C
csc 2 600 − tan 2 300
3. If the smallest angle of a right triangle is A = 270 and the length of the hypotenuse is 8 cm,
find the length of the shortest side in terms of a trigonometric function.
Answers
1. (a)
5
(b)
61
2. (a) -1
3. a=8sin270
(b) 1
53
2
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