化简(1-cos2α)分之(sin2α*tanα)快

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化简(1-cos2α)分之(sin2α*tanα)快化简(1-cos2α)分之(sin2α*tanα)快化简(1-cos2α)分之(sin2α*tanα)快(1-cos2α)分之(sin2α*tanα

化简(1-cos2α)分之(sin2α*tanα)快
化简(1-cos2α)分之(sin2α*tanα)

化简(1-cos2α)分之(sin2α*tanα)快
(1-cos2α)分之(sin2α*tanα)
=(2sinacosa)*(sina/cosa) / (1-1+2sin²a).倍角公式
=2sin²a/2sin²a
=1