Решите уравнение:
\(2\cos x=-1\)
\(\pm\frac{2\pi}{3}+2\pi n,n\in Z\)
\(\frac{2\pi}{3}+2\pi n,n\in Z\)
\(\pm\frac{\pi}{3}+2\pi n,n\in Z\)
\(\frac{\pi}{3}+2\pi n,n\in Z\)