Найдите корень уравнения cos п (2x-5) / 4=корень из 2/2

Cos ((2x - 5) / 4 = √2/2

(2x - 5) / 4 = √2/2

(2x - 5) / 4 = ( + - ) arccos (√2/2) + 2πn, n∈Z

(x) / 2 - 5 = ( + - ) (π/4) + 2πn, n∈Z

(x) / 2 = ( + - ) (π/4) + 5 + 2πn, n∈Z

x2 = (2) * ( + - ) (π/2) + 10 + 4πn, n∈Z