已知tan(x+y)=3,tan(x-y)=5则tan2x等于
已知tan(x+y)=2/5,tan(x-y)=-1/4,则tan2x的值是
已知3cos(2x+y)+5cosy=0,则tan(x+y)tanx的值是
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求证:tan(x+y)+tan(x-y)=sin2xcos
已知5siny=sin(2x+y),求证:tan(x+y)=3/2tanx
已知2cos(2x+y)=cosy,求tan(x+y)tany的值
y=3tan(2x-π/4)
已知为x锐角,2tan(π-x)-3cos(π/2+y)+5=0,tan(π+x)+6sin(π+y)-1=0则sinx
y=tan(x+y),求dy/dx
已知sin(2α+β)=3sinβ,设tanα=x,tanβ=y,记y=f(x),
若tan(x)=4tan(y),求x,y关系 (已知0
已知tan(x-y)=1/2,tan&=1/7,$属于(0,90),&属于(90,180),求2$-&