Решите уравнение 2cosxcosx2x-cosx=0

[latex]2cosx*cos2x-cosx=0\\ cosx(2cos2x-1)=0\\ cosx=0; \ 2cos2x-1=0\\ cosx=0\\ x=\frac{\pi}{2}+\pi n, n\in Z\\ 2cos2x-1=0\\ 2cos2x=1\\ cos2x=\frac{1}{2}\\ 2x=\pm \frac{\pi}{3}+2\pi k, k \in Z\\ x=\pm \frac{\pi}{6}+\pi k , k\in Z\\ \\ x=\frac{\pi}{2}+\pi n, n\in Z\\ x= \frac{\pi}{6}+\pi k , k\in Z\\ x=- \frac{\pi}{6}+\pi k , k\in Z\\ [/latex]