证明tan^2-sin^2=tan^2sin^2 - 知识问答

证明tan^2-sin^2=tan^2sin^2

5个回答

tan^2-sin^2-tan^2sin^2
=tan^2(1-sin^2) -sin^2
=tan^2cos^2-sin^2
=sin^2-sin^2
=0
所以tan^2-sin^2=tan^2sin^2

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