tanA等于十二分之五 求tan二分之A
人气:358 ℃ 时间:2020-05-23 23:18:41
解答
tanA=2tan(A/2)/(1-tan^2A)=5/12
24tan(A/2)=5-5tan^2(A/2)
5tan^2(A/2)+24tan(A/2)-5=0
tan(A/2)=5或tan(A/2)=-1/5
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