化简cos(x+y)sinx-sin(x+y)cosx
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化简cos(x+y)sinx-sin(x+y)cosx化简cos(x+y)sinx-sin(x+y)cosx化简cos(x+y)sinx-sin(x+y)cosxcos(x+y)sinx-sin(x+
化简cos(x+y)sinx-sin(x+y)cosx
化简cos(x+y)sinx-sin(x+y)cosx
化简cos(x+y)sinx-sin(x+y)cosx
cos(x+y)sinx-sin(x+y)cosx
=-[sin(x+y)cosx-cos(x+y)sinx]
=-sin(x+y-x)=-siny
参考公式:sin(α-β)=sinαcosβ-cosαsinβ
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
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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),