2cos(2x-pi)=3 помогите

Question

2cos(2x-pi)=3 помогите

Answer 1

Решение
2cos ( 2x + пи/3) <= 1<br>cos ( 2x + пи/3) <= 1/2<br>пи/3 +2пи*n <= 2x + пи/3<= 5пи/3+2пи*n<br>2пи*n <= 2x <= 4пи/3+2пи*n<br>пи*n <= x <= 2пи/3+пи*n</span>