По этапно cos (x-п/4)=1/2

Решите задачу:

$cos (x- \frac{\pi}{4})= \frac{1}{2} \\x- \frac{\pi}{4}= \frac{\pi}{3} +2\pi n,\ n \in Z \\x=\frac{\pi}{3}+ \frac{\pi}{4}+2\pi n,\ n \in Z \\x_1= \frac{7\pi}{12} +2\pi n,\ n \in Z \\x- \frac{\pi}{4}= -\frac{\pi}{3} +2\pi n,\ n \in Z \\x= \frac{\pi}{4}-\frac{\pi}{3}+2\pi n,\ n \in Z \\x_2= \frac{3\pi-4\pi}{12} +2\pi n,\ n \in Z \\x_2= -\frac{\pi}{12} +2\pi n,\ n \in Z$