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))
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) tanx tanx tanx tanx tanx tanx