cos^4x-sin^4x+2sin^2x=?

娃哈哈qv1822022-10-04 11:39:542条回答

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happy_hjl 共回答了12个问题 | 采纳率100%: cos^4x-sin^4x+2sin^2x=cos^2x-sin^2x+2sin^2x=1; 1年前

wxf2006 共回答了4435个问题 | 采纳率: cos^4x-sin^4x+2sin^2x
=(cos^2x-sin^2x)(cos^2x+sin^2x)+2sin^2x
=cos^2x-sin^2x+2sin^2x
=cos^2x+sin^2x
=1; 1年前

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