证明(sin2a/1-cos2a)*(cosa/1-sina)=1+sina/sina
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证明(sin2a/1-cos2a)*(cosa/1-sina)=1+sina/sina
证明(sin2a/1-cos2a)*(cosa/1-sina)=1+sina/sina
证明(sin2a/1-cos2a)*(cosa/1-sina)=1+sina/sina