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(tan30度)/(1-tan^2 30度)=?
人气:294 ℃ 时间:2020-06-22 16:57:18
解答
(tan30度)/(1-tan^2 30度)
=1/2【2(tan30度)/(1-tan^2 30度)】
=1/2*tan60°
=(根号3)/2
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