Уравнение решите
Cos²x+sinx=1

cos2x + sinx = 1 1 - 2sin^2(x) + sinx = 1 -2sin^2(x) +sinx=0 t=sin(x) -2t^2+t=0 t1=0 t2=1/2 sin(x)=0 sin(x)=1/2 30° and 180°