Question

Решите уравнение срочно!!!!!!!!!!!!!!!!!!!!!!!!!!!!! sin^2(2x)+cos^2(2x)=cosx

Answer 1

$\sin^2(2x)+\cos^2(2x)=\cos x\\ 1 = \cos x\\ x = 2\pi n, \quad n\in \mathbb{Z}$

Answer 2

Sin²2x+cos²2x=cosx
1=cosx
x=2πk,k∈Z