FINDING THE EXACT VALUE OF TRIG FUNCTIONS WORKSHEET

Problem 1 :

Find the exact value of cos (7π/4)

Problem 2 :

Find the exact value of sin (-30°)

Problem 3 :

Find the exact value of cos (600°)

Problem 4 :

Find the exact value of sin (9π/2)

Problem 5 :

Find the exact value of tan (585°)

Problem 6 :

Find the exact value of cos (23π/6)

Problem 7 :

Find the exact value of cos (-11π/4)

Problem 8 :

Find the exact value of sin (-13π/4)

Solution

Answer Key

1) cos (7π/4) = 1/√2

2) -sin 30° = -1/2

3) cos 600° = -1/2

4) sin 810° = 1

5) tan 585° = 1

6) cos (23π/6) = √3/2

7) cos (-11π/4) = -1/√2 (or) -√2/2

8) sin (-13π/4) = 1/√2 (or) √2/2