试证明(tanx+secx)^2=(1+sinx)/(1-sinx)
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试证明(tanx+secx)^2=(1+sinx)/(1-sinx)
![试证明(tanx+secx)^2=(1+sinx)/(1-sinx)](/uploads/image/z/16160064-24-4.jpg?t=%E8%AF%95%E8%AF%81%E6%98%8E%28tanx%2Bsecx%29%5E2%3D%281%2Bsinx%29%2F%281-sinx%29)
(sinx/cosx+1/cos)^2 =(sinx+1)^2/cosx^2 =(sinx+1)^2/(1-sinx^2) =(sinx+1)(sinx+1)/(1+sinx)(1-sinx) =(sinx+1)/(1-sinx)
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