Question

if cos2x=sin4x where 2x and 4x are acute angle then what is the value of x

Answer 1

cos2x = sin4x
=> sin (90° - 2x) = sin4x
=> 90° - 2x = 4x
=> 4x + 2x = 90°
=> 6x = 90°
=> x = 90°/ 6
=> x = 15°

Hope it'll help...:)