Question

cos 2theta = sin 4theta
then find theta​

Answer 1

Answer:

cos 2Φ=sinr4Φ

cos2Φ=2sin2Φcos2Φ

2sin2Φ=1

sin2Φ=1/2

sin2Φ=sin(30)

2Φ=30

Φ=15

so theta is equal to 15°