Cos(Π\3-2x)=1\2 поогиье мне
Cos ( 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>