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化简tan(α+180度)+cos(-α)+cos(α+180度)分之sin(180度+α)-tan(-α)-tan(360度+α)
人气:272 ℃ 时间:2020-04-14 17:52:22
解答
(sin(a+pi)-tan(-a)-tan(a+2pi))/(tan(a+pi)+cos(-a)+cos(a+pi))
=(-sin a+tan a-tan a)/(tan a+cos a -cos a)
=-sin a / tan a
=-cos a
答案是负cos a
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