4 sin^2 x + sgrt2*(tgx)= 0;
cos x не +=0;
4 sin^2 x + sgrt2* sin x/ cos x = 0;
4 cos x * sin^2 x + sgrt2*sin x = 0;
sin x(4 cos x * sin x + sgrt2)= 0;
sin x(2 sin 2x + sgrt2) = 0;
sin x = 0; x = pi*k; k-Z.
2 sin 2x + sgrt2 = 0;
sin 2x = - sgrt2/2;
2x = [ - pi/4 + 2 pik; x = [- pi/8 + pi*k; k-Z
[ - 3pi/4 + 2 pik; [ -3pi/8 + pi*k; k-Z