tanα=1/4,π
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tanα=1/4,π
tanα=1/4,π
tanα=1/4,π
sinα*cosα
=(sinα*cosα)/1
=(sinα*cosα)/(sin^2α+cos^2α)
=tanα/(tan^2α+1)
=(1/4)/(1/16+1)
=4/17
(tanπ/4+tanα)/(1-tanπ/4tanα)怎么解
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