tan平方x-sin平方x
=tan^2x(1-cos^2x)
=tan^2xsin^2x
求證:tan平方x-sin平方x=tanx
求證:tan平方x-sin平方x=tanx
數(shù)學(xué)人氣:429 ℃時(shí)間:2019-12-31 16:29:40
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