化简 1+sin(x-360°)*cos(x-270°)-2*cosx*cosx

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化简1+sin(x-360°)*cos(x-270°)-2*cosx*cosx化简1+sin(x-360°)*cos(x-270°)-2*cosx*cosx化简1+sin(x-360°)*cos(x-

化简 1+sin(x-360°)*cos(x-270°)-2*cosx*cosx
化简 1+sin(x-360°)*cos(x-270°)-2*cosx*cosx

化简 1+sin(x-360°)*cos(x-270°)-2*cosx*cosx
=1+sinx*cos(x+90°)-2*cosx*cosx
=1+sinx*(-sinx)-2*cosx*cosx
=1-sinx*sinx-2*cosx*cosx
=-cosx*cosx
=cosx^2