√14 cos x + √7 = 0;
cos x = (-√7/√14);
cos x = - √(1/2);
cos x = - √2 / 2;
x = +- 3π/4 + 2 πk;
k∈Z.
2√3 sin x - 3 = 0;
2√3 sin x = 3;
2√3 sin x = √3 *√3;
2 sin x = √3;
sin x = √3/2;
x1 = π/3 + 2πk;
x2=2π/3 + 2πk; k∈Z
.
sin 2x * tg(x/4) = 0;
sin 2x = 0 tg(x/4) = 0;
2x = πk ; x/4 = πk;
x = πk/2 x = 4πk.
ctg 3x= √3;
3x = π/6 + πk;
x = π/18 + πk/3; k∈Z
tg^2(2x) = 3;
tg(2x) = + - √3;
2x = +- π/3 + πk;
x = +- π/6 + πk/2; k∈Z