从tanα=sin2α/(1+cos2α)=(1-cos2α)/sin2α怎么得出tanα=(1+sin2α-cos2α)/(1+sin2α+cos2α)?

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从tanα=sin2α/(1+cos2α)=(1-cos2α)/sin2α怎么得出tanα=(1+sin2α-cos2α)/(1+sin2α+cos2α)?从tanα=sin2α/(1+cos2α)=

从tanα=sin2α/(1+cos2α)=(1-cos2α)/sin2α怎么得出tanα=(1+sin2α-cos2α)/(1+sin2α+cos2α)?
从tanα=sin2α/(1+cos2α)=(1-cos2α)/sin2α怎么得出tanα=(1+sin2α-cos2α)/(1+sin2α+cos2α)?

从tanα=sin2α/(1+cos2α)=(1-cos2α)/sin2α怎么得出tanα=(1+sin2α-cos2α)/(1+sin2α+cos2α)?
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