Question

Решить неравенство :
cos2x ≥ √2/2

Answer 1

cos2x ≥ √2/2
-pi/4+2pi*n≤2x≤pi/4+2pi*n
-pi/8+pi*n≤x≤pi/8+pi*n≤
[-pi/8+pi*n;pi/8+pi*n]