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sin^4(a/2)-cos^(4a/2)=
人气:190 ℃ 时间:2020-06-14 03:36:26
解答
sin^4(a/2)-cos^4(a/2)
=[sin^2(a/2)-cos^2(a/2)][sin^2(a/2)+cos^2(a/2)]
=sin^2(a/2)-cos^2(a/2)
=-cosa
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