Помогите прошу.какие сможете.
1.tg^2-4tgx+3=0
2.3sin^2x-4sinx cosx+cos^2x=0
3.cos2x=2sin^2x
4.sin6x cos2x=sin5x cos3x

1. tg^2 x - 4 tg x + 3 = 0;tgx = 1;  x = pi/4 + pi*k; k-Ztg x = - 3; x = - arctg 3 + pi*k; k-Z.2. 3 sin^2 x - 4 sinx*cos x +cos^x = 0;    /cos^2 x ≠ 0; 3 tg^x - 4 tg x + 1 = 0; tg x = 1; x = pi/4 + pi*k; k-Z.tgx = 1/3;  x = arctg (1/3)  + pi*k; k-Z.3. cos(2x) = 2 sin^2 x; cos (2x) = 1 - 2 sin^2 x;1 - 2 sin^2 x = 2 sin^2 x;4 sin^2 x = 1; sin^2 x = 1/4; sin x = 1/2   sin x = - 1/2.x= + - pi/6 + pi*k; k-Z.