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已知α是锐角,且根号3tan(α+20°)=3,则α为() A,30° B,40° C,45° D,60°
人气:432 ℃ 时间:2020-06-23 09:06:06
解答
  √3tan(α+20°)=3
  =>tan(a+20°)=√3
  =>a+20°=60°
  =>a=40°
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