证明1-COS^2α/(SINα-COSα)-SINα+COSα/(TAN^2a-1)=SINa+COSa
<p>问题：证明1-COS^2α/(SINα-COSα)-SINα+COSα/(TAN^2a-1)=SINa+COSa<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">李允的回答：<div class="content-b">网友采纳 左边=(1-cos²α)/(sinα-cosα)-(sinα+cosα)/(tan^2α-1)=sin²α/(sinα-cosα)-(sinα+cosα)/(sin²a/cos²α-1)=sin²α/(sinα-cosα)-(sinα+cosα)cos²α/(sin²α-cos²...
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