Пожалуйста
Cos2x-sin2x+2sin²x+sinx-cosx=0

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cos2x+sin2x+2sin²x+sinx+cosx=0 cos²x-sin²x+2sinxcosx+2sin²x+sinx+cosx=0 sin²x+2sinxcosx+cos²x+sinx+cosx=0 (sinx+cosx)²+(sinx+cosx)=0 (sinx+cosx)(sinx+cosx+1)=0 1) sinx+cosx=0 √2sin(x+π/4)=0 sin(x+π/4)=0 x+π/4=πn x=-π/4+πn,n∈Z 2) sinx+cosx+1=0 sinx+cosx=-1 √2sin(x+π/4)=-1 sin(x+π/4)=-√2/2 x+π/4=(-1)ᵏ•(-π/4)+πk x=(-1)ᵏ⁺¹•(π/4)-π/4+πk,k∈Z.