tanx=2,tan(x-y)=-3/5,则tany=?
人气：319 ℃ 时间：2020-01-25 06:32:10
解答
tan(x-y)=(tanx-tany)/(1+tanxtany)
(2-tany)/(1+2tany)=-3/5
3+6tany=5tany-10
tany=-13
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