求证.(tanx+tany)/(tanx-tany)=(sinx+siny)/(si求证.(tanx+tany)/(tanx-tany)=(sinx+siny)/(sinx-siny)
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求证.(tanx+tany)/(tanx-tany)=(sinx+siny)/(si求证.(tanx+tany)/(tanx-tany)=(sinx+siny)/(sinx-siny)求证.(tanx
求证.(tanx+tany)/(tanx-tany)=(sinx+siny)/(si求证.(tanx+tany)/(tanx-tany)=(sinx+siny)/(sinx-siny)
求证.(tanx+tany)/(tanx-tany)=(sinx+siny)/(si
求证.(tanx+tany)/(tanx-tany)=(sinx+siny)/(sinx-siny)
求证.(tanx+tany)/(tanx-tany)=(sinx+siny)/(si求证.(tanx+tany)/(tanx-tany)=(sinx+siny)/(sinx-siny)
1、sin(x+y）/sin(x-y)
=(sinxcosy+cosxsiny)/(sinxcosy-cosxsiny) 上下都除以cosxcosy
=(tanx+tany)/(tanx-tany)
2、(tanx+tany)/(tanx-tany)
=(sinx/cosx+siny/cosy)/(sinx/cosx-siny/cosy)
=[(sinxcosy+cosxsiny)/cosxcosy]/[(sinxcosy-cosxsiny)/cosxcosy]
=(sinxcosy+cosxsiny)/(sinxcosy-cosxsiny)
=sin(x+y)/sin(x-y).
楼主，此题不成立。你带x=π/6,y=π/3去试试............
不懂，请无视
求证.(tanx+tany)/(tanx-tany)=(sinx+siny)/(si求证.(tanx+tany)/(tanx-tany)=(sinx+siny)/(sinx-siny)
求证tanx+tany/tanx-tany=sin(x+y）/sin(x-y)
求证tanx+tany/tanx-tany=sin（x+y）/sin（x-y）（详细步骤）
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
已知(tanx)^2=2(tany)^2+1,求证(siny^)2=2(sinx^)2-1
若x+y+z=nπ,求证:tanx+tany+tanz=tanxtanytanz
已知0小于X,y小于90度,tanx=3tany,求证x-y
证明 (tanX+tanY)/(tanX-tanY)=(sin(X+Y))/(sin(X-Y))thanks
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