Practice with Cofunctions Terms of Use    Contact Person: Donna Roberts
Directions: Solve the following problems using your knowledge of cofunctions. Choose the best answers.

1.
cos 10º = sin ____

Choose:
 10º 60º 80º 90º

2.
tan 50º = ____

Choose:
 cos 40º sin 40º cot 40º cot 50º

3.
Choose:

4.
sin(90 - θ) = _____

Choose:
 sin θ cos(90 - θ) cos θ tan θ

5.
Find the function value of cot 60º.

Choose:
 2

6.
Given:

find the tan x.

Choose:
 3/4 4/3 5/4 4/5

7.

Choose:
 sec x cot x -tan x -cot x

8.

Choose:
 sin2 x sin x • tan x csc x cos x

9.
Simplify:

Choose:
 cos x sin x tan x cot x

10.
Simplify:

Choose:
 sin x tan x cos x csc x

11.

Choose:
 TRUE FALSE cannot be determined

12.

Choose:
 TRUE FALSE cannot be determined

13.

Choose:
 TRUE FALSE cannot be determined

14.
If sin(x + 20) = cos (2x + 10), find x.

Choose:
 10 20 30 40

15.
If tan(4x + 40) = cot (2x - 10), find x.

Choose:
 10 20 30 40

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