Question

Решите неравенство 1-2cosx>0. Срочно​

Answer 1

Ответ:

$1-2cosx>0\ \ \ \to \ \ \ 2cosx<1\\\\cosx<\dfrac{1}{2}\\\\\\\dfrac{\pi}{3}+2\pi n<x<\dfrac{5\pi }{3}+2\pi n\ ,\ n\in Z\\\\x\in \Big(\, \dfrac{\pi}{3}+2\pi n\ ;\ \dfrac{5\pi }{3}+2\pi n\Big)\ ,\ n\in Z$