Question

If sin 3y = cos 2y and 0° 90°, find the value of y

Answer 1

y = 18°

Explanation:

sin 3y = cos 2y, but sin θ

= cos(90 - θ)

sin 3y = cos(90 - 3y)

cos(90 - 3y) = cos 2y

90 - 3y = 2y

5y = 90

y = 905

y = 18o