求证1+2sina cosa/sin^2a-cos^2a=tana+1/tana-1
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求证1+2sina cosa/sin^2a-cos^2a=tana+1/tana-1
求证1+2sina cosa/sin^2a-cos^2a=tana+1/tana-1
求证1+2sina cosa/sin^2a-cos^2a=tana+1/tana-1
(1+2sinacosa)/[(sina)^2-(cosa)^2]
=(sina+cosa)^2/[(sina+cosa)(sina-cosa)]
=(sina+cosa)/(sina-cosa) 分子分母同除cosa
=(tana+1)/(tana-1)
求证:1+sina+cosa/1+sina-cosa+1-cosa+sina/1+cosa+sina=2/sina
求证sina^2+sin&^2-sina^2*sin&^2+cosa^2*cos&^2=1
求证cosa/1+sina-sina/1+cosa=2(cosa-sina)/1+sina+cosa
求证:1+sina+cosa+2sina cosa/1+sina+cosa=sina+cosa
求证1+sina-cosa/1+sina+cosa=tana/2
求证:cosa(cosa-cosb)+sina(sina-sinb)=2sin^2a-b/2
求证:(1+sina+cosa+2sinacosa)/(1+sina+cosa)=sina+cosa
求证:1+sinA+cosA+2sinAcosA/1+sinA+cosA=sinA+cosA
求证:1+sina+cosa分之1+sina+cosa+2sinacosa=sina+cosa
求证(1+sina+cosa+2sinacosa)/(1+sina+cosa)=sina+cosa
求证,2(cosA-sinA)/(1+sinA+cosA)=cosA/(1+sinA)-sinA/(1+sinA)把sinA/(1+sinA)改为sinA/(1+cosA)
求证,2(cosA-sinA)/(1+sinA+cosA)=cosA/(1+sinA)-sinA/(1+sinA)把sinA/(1+sinA)改为sinA/(1+cosA),详尽点.
三角函数恒等式求证:cosa + sina / cosa - sina + cosa - sina / cosa + sina = cos^2a - sin^2a / 2
求证tana/2=sina/1+cosa
求证(cosa-sina)^2=1-sin2a
求证1+2sina cosa/sin^2a-cos^2a=tana+1/tana-1
求证:1+2sina cosa /sin^2a -cos^2a = tana +1/tana -1.
求证sin^2A+cos^2A=1tanA=sinA除以cosA