证明 (tanX+tanY)/(tanX-tanY)=(sin(X+Y))/(sin(X-Y))thanks
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证明(tanX+tanY)/(tanX-tanY)=(sin(X+Y))/(sin(X-Y))thanks证明(tanX+tanY)/(tanX-tanY)=(sin(X+Y))/(sin(X-Y))
证明 (tanX+tanY)/(tanX-tanY)=(sin(X+Y))/(sin(X-Y))thanks
证明 (tanX+tanY)/(tanX-tanY)=(sin(X+Y))/(sin(X-Y))
thanks
证明 (tanX+tanY)/(tanX-tanY)=(sin(X+Y))/(sin(X-Y))thanks
利用tanx=sinx/cosx的定义,左边的一定可以化为sinx和cosx的式子
同理右边的可以分解为sinx和cosx的式子
二者一定相等
证明 (tanX+tanY)/(tanX-tanY)=(sin(X+Y))/(sin(X-Y))thanks
求证.(tanx+tany)/(tanx-tany)=(sinx+siny)/(si求证.(tanx+tany)/(tanx-tany)=(sinx+siny)/(sinx-siny)
高手进tanx+tany/tanx-tany=3/2 求tanx/tany?
如果实数x,y满足|tanx|+|tany|>|tanx+tany|,且y∈（π,3π/2),则|tanx-tany|等于
已知tanx=3tany(0
设tanx=3tany(0
tan(x+y)=tanx+tany吗
已知tanx=3tany(0
如果 2sin(x-y)=sin(x+y),证明 tanx= 3 tany
求证tanx+tany/tanx-tany=sin(x+y）/sin(x-y)
证明：tanx sinx / (tanx -sinx)=(tanx+sinx) / tanx sinx
证明:(sinX*tanX)/(tanX-sinX)=(tanX+sinX)/(tanX*sinX)
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