sin(2x)+cos(2x)-2*cos²x=2*sinx*cosx+cos²x-sin²x-2*cos²x=
2*sinx*cosx-sin²x-cos²x=-(sin²x-2*sinx*cosx+cos²x)=-(sinx-cosx)².
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sin(2x)+cos(2x)-2*cos²x=2*sinx*cosx+cos²x-sin²x-2*cos²x=
2*sinx*cosx-sin²x-cos²x=-(sin²x-2*sinx*cosx+cos²x)=-(sinx-cosx)².