Question

Срочно!!!! Решите пожалуйста
1/2<=cosx<=1

Answer 1

$\mathtt{ \dfrac{1}{2}\leq cosx \leq 1}\\\mathtt{ \dfrac{5\pi}{3}\leq x\leq 2\pi}\\\mathtt{ \dfrac{5\pi}{3}+2\pi k\leq x\leq 2\pi+2\pi k,k\in\mathbb{Z}}$