Cos2x+0.5sin2x+sin^2x=0
1 - 2Sin² x + 0,5 ·2Sin x Cos x + Sin²x = 0 Sin ² x + Cos² x - 2Sin² x +Sin xCos x +Sin² x = 0 Cos²x+ Sin x Cos x = 0 Cos x(Cos +Sinx) = 0 cos x = 0 или Cos x + Sin x = 0 | : Сos x ≠0 x = π/2 + πk,k∈Z 1 + tg x = 0 tg x = -1 x = -π/4 + πn, n∈Z