化简sin(x+y)sinx+cos(x+y)cosx等于?

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 sin(2x+y)/sinx-2cos(x+y) 化简 化简cos(x+y)sinx-sin(x+y)cosx sinx*sin(x+y)+cosx*cos(x+y)等于? cos（x+y）sinx-sin（x+y）cosx y= sin x cos x+sinx+cosx的值域 证明 [sin(2x+y)/sinx]-2cos(x+y)=siny/sinx 求证sin（2x+y)/sinx-2cos(x+y)=siny/sinx 求证：sin(2x+y)/sinx-2cos(x+y)=siny/sinx sinx(sin^-1(X)/cos^-1(x) 化简 化简((sinx)^4)-sin²x+cos²x 证明sinx+cos(x+y)siny/cosx-sin(x+y)siny=tan(x+y) 化简sin(x+y)sin(x-y)-cos(x+y)cos(x-y)的结果是? 化简sin(x+y)cos(x-y)+cos(x+y)sin(x-y) 曲线Y= sin x 1_________ - __ 求导?sin x +cos x 2sinx /(sinx +cosx ) - 1/2 请问怎么证明sinX+sin(X+Y)+sin(X+2Y)/cosX+cos(X+Y)+cos(X+2Y)=tan(X+Y),