证明1-COS^2α/(SINα-COSα)-SINα+COSα/(TAN^2a-1)=SINa+COSa
问题描述:
证明1-COS^2α/(SINα-COSα)-SINα+COSα/(TAN^2a-1)=SINa+COSa
答
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...