Question

If sin 2A = cos 3A, then A is
=
A. 5
B. 15
C. 18
D. 36

Answer 1

C

Explanation:

It looks like this question is testing your knowledge of the fact that if 2 angles are complementary, then the sine of the first angle equals the measure of the second angle.

So this means 2A+3A=90 -> A=18