证明:【2(cosx-sinx)】/(1+sinx+cosx)=cosx/(1+sinx) -sinx/(1+cosx)
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证明:【2(cosx-sinx)】/(1+sinx+cosx)=cosx/(1+sinx) -sinx/(1+cosx)
![证明:【2(cosx-sinx)】/(1+sinx+cosx)=cosx/(1+sinx) -sinx/(1+cosx)](/uploads/image/z/15598354-58-4.jpg?t=%E8%AF%81%E6%98%8E%3A%E3%80%902%28cosx-sinx%29%E3%80%91%2F%281%2Bsinx%2Bcosx%29%3Dcosx%2F%281%2Bsinx%29+-sinx%2F%281%2Bcosx%29)
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