If sin 2A = cos 15°, then the smallest positive value of A is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 37.5°.
Given that
If sin 2A = cos 15°,
sin 2A = cos (90° - 75°) = sin 75°
2A = 75°
A = 75°/2 = 37.5°