Задание

Решите уравнение:

\(2\cos x=-1\)

  • \(\pm\frac{2\pi}{3}+2\pi n,n\in Z\)
  • \(\frac{2\pi}{3}+2\pi n,n\in Z\)
  • \(\pm\frac{\pi}{3}+2\pi n,n\in Z\)
  • \(\frac{\pi}{3}+2\pi n,n\in Z\)