一个三角形知道两个角的正切求第三个角的正切
人气：343 ℃ 时间：2020-06-16 17:25:41
解答
设tanA=a tanB=b 求tanC
tanC=tan(180-(A+B)=-tan(A+B)
=-(tanA+tanB)/(1-tanAtanB)
=-(a+b)/(1-ab)=(a+b)/(ab-1)
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