√2 * ( sin 2x * cos pi/4 + cos 2x * sin pi/4) + √ 2 * cos x = sin 2x - 1;
√2 * (sin 2x * √2 / 2 + cos 2x * √2/2) + √2 * cos x = sin 2x - 1;
sin 2x + cos 2x + √2* cos x = sin 2x - 1;
cjs 2x + √2 cos x + 1= 0;
2 cos^2 x - 1 + √2 cos x + 1= 0;
2 cos^2 x + √2 cos x = 0;
cos x( 2 cos x + √2) = 0;
cos x = 0; x = π/2 + πk; k-Z или
cos x = - √2 / 2; x = + - 3π/4 + 2 πn ; n-Z.
часть б)
- 5π/2; - 3π/2; - 5π/4.