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化简cos(a-兀)/sin(兀-a) xsin(a-2兀)Xcos(2兀-a)要详细过程!
人气:428 ℃ 时间:2020-02-04 01:03:39
解答
cos(a-兀)/sin(兀-a) xsin(a-2兀)Xcos(2兀-a)
=cos(π-a)/sina×sina×cosa
=-cosa×cosa
=-cos²a
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