Помогите решить cos(x+p/4)\leq\sqrt{2} /2

Question

Помогите решить
cos(x+p/4)\leq\sqrt{2} /2

Answer 1

Cos(x+π/4)=√2/2
x+π/4=-π/4+2πk U x+π/4=π/4+2πk
x=-π/2+2πk U x=2πk,k∈z