已知tanx=1/4,tany=-3,求tan(x+y)的值
人气:192 ℃ 时间:2019-11-05 09:09:22
解答
tan(x+y) = [tanx+tany]/[1-tanx*tany]
= (1/4 - 3 )/(1+3/4)
=-11/7
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