Теңсіздікті шешіңіз: 2соsх > -1.

Жауап нұсқалары

1. A.$\left( \frac{\pi}{3} + 2\pi k,\; \frac{2\pi}{3} + 2\pi k \right),\quad k \in \mathbb{Z}$
2. B.$\left( \frac{\pi}{3} - 2\pi k,\; \frac{2\pi}{3} + 2\pi k \right),\quad k \in \mathbb{Z}$
3. C.$\left( -\frac{2\pi}{6} + 2\pi k,\; \frac{2\pi}{3} + 2\pi k \right),\quad k \in \mathbb{Z}$
4. D.$\left( -\frac{2\pi}{3} + 2\pi k,\; \frac{2\pi}{3} + 2\pi k \right),\quad k \in \mathbb{Z}$дұрыс