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y=cos^4x-sin^4x的周期是 3Q
人气:208 ℃ 时间:2020-09-27 21:33:19
解答
cos^4x-sin^4x
=(cos^2x-sin^2x)(cos^2x+sin^2x)
=cos^2x-sin^2x
=2cos^2x-1
=cos2x
所以周期为∏
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