=（sin^2A)/(cos^2A)-sin^2A-（sin^2A)/(cos^2A)*sin^2A
=(sin^2A-sin^4A-sin^2Acos^2A)/cos^2A
=(sin^2A(1-sin^2A-cos^2A))/cos^2A
=0
化简：tan^2A-sin^2A-tan^2Asin^2A
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