Question

If cos 2θ = sin 4θ where 2θ,4θ are acute angles, find the value of θ.

Answer 1

Hey mate

Here is ur answer

Cos 2θ = Sin 4θ
Sin (90-2θ) = Sin 4θ
90 - 2θ = 4θ
90 = 4θ + 2θ
90 = 6θ
θ = 90/6
θ = 15

Answer 2

Check this attachment :-)