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化简(sin2α+2sin^2α)/(1-tanα)
人气:409 ℃ 时间:2020-06-16 12:15:57
解答
(2(sinα)^2+sin2α)/(1+tanα)=sin2α(2(sinα)^2/(2sinαcosα)+1)/(1+tanα)=sin2α*(tanα+1)/(1+tanα)=sin2α
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