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求证sin^4x+cos^4x=1-2sin^2xcos^2x
人气:446 ℃ 时间:2020-05-28 19:21:40
解答
求证sin^4x+cos^4x=1-2sin^2xcos^2x
证:sin^4x+cos^4x=(sin^2x+cos^2x)^2-2sin^2xcos^2x
=1-2sin^2xcos^2x
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