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sin^2a乘以tana+cos^2a乘以cota+2sina乘以cosa-cota
人气：323 ℃　时间：2020-05-08 01:13:06
解答
(1-cos^2a)sina/cosa+(1-sin^2a )cosa/sina+2sina cosa-cota
=sina/cosa+cosa/sina-cosa/sina
=(1-cos^2a)/(sina cosa)
=tana
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