Question

Use a sum or difference formula to find the exact value of the following.

131
TT
sin
TT
cos
36
+ cos
1377
sin
18
18
36
:
口口
Х
3
?

Answer 1

D.

Explanation:

In order to get the answer, the sum of difference is used to find an exact value therefore D is the right answer!

answer was right on test.