化简cos(x+3o.)CoSx+Sin(x+30.)Sinx括号内的是X+30度，急

化简cos(x+3o.)CoSx+Sin(x+30.)Sinx括号内的是X+30度，急 化简sin(x+y)sinx+cos(x+y)cosx 化简sin(x+y)sinx+cos(x+y)cosx等于? 化简cos(x+y)sinx-sin(x+y)cosx 化简cos(x+y)sinx-sin(x+y)cosx sinx+cosx/sinx-cosx=2 求sinx/cos^3x +cosx/sin^3x 化简sin(x-π/3)-cos(x=π/6)+根号3cosx 化简:sin(x-π/3)-cos(x+π/6)+根号3cosx, sin²x+2sinx+cosx+3cos²x化简 sinx-2cosx=o,sin²x-sinxcosx-2cos²+2 化简sin^4x/sinx-cosx - (sinx+cosx)cos^2x/tan^2x-1 化简 1+sin（x-360°）*cos（x-270°）-2*cosx*cosx 证明成立：[cos(3x)-sin(3x)]/(cosx+sinx)=1-2sin(2x). 已知2sin平方x-3sinxcosx+cos平方=0 求(cosx-sinx)/(cosx+sinx) 化简F(X)=2（COSX）^2+2 sin x cos x+1对不起，打错了是F(X)=2（COSX）^2+2*根号3 sin x cos x+1 3sinx-2cosx=0 (1)(cosx-sinx)/(cosx+sinx)+(cosx+sinx)/(cosx-sinx) (2)sin^2 x-2sinxcosx+4cos^2 x 化简1+sin²x-cos²x-sinx/2sinxcosx-cosx化简1+sin²x-cos²x-sinx_______________2sinxcosx-cosx 已知sinx+cosx/sinx-cosx=2,求2cos(π-x)-3sin(π+x)/4cos(-x)+sin(2π-x)