2 sin (П/4 + х) * sin ( П/4 - х) + sin^2x = 0 cos(П/4 + х - П/4 + х) - cos(П/4 + х + П/4 - х) + sin^2t = 0 cos2x - cos(П/2) + sin^2t = 0 cos^2x - sin^2x + sin^2t = 0 cos^2x = 0 cosx = 0 x = П + Пk