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帮帮化简sin^4x-cos^4x
(sin^2x+cos^2x )(sin^2x-cos^2x)怎么得sin^2x-cos^2x?麻烦
人气：205 ℃　时间：2020-06-16 19:05:24
解答
sin^4x-cos^4x
=(sin^2x-cos^2x)(sin^2x+cos^2x)
=(sin^2x-cos^2x)
=-cos2x
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