证明:1/tana +sina/1+cosa =1/sina(1) / (tana) + (sina) /(1+cosa) = (1) /(sina)
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![证明:1/tana +sina/1+cosa =1/sina(1) / (tana) + (sina) /(1+cosa) = (1) /(sina)](/uploads/image/z/1801942-70-2.jpg?t=%E8%AF%81%E6%98%8E%EF%BC%9A1%2Ftana+%2Bsina%2F1%2Bcosa+%3D1%2Fsina%281%29+%2F+%28tana%29+%2B+%28sina%29+%2F%281%2Bcosa%29+%3D+%281%29+%2F%28sina%29)
证明:1/tana +sina/1+cosa =1/sina(1) / (tana) + (sina) /(1+cosa) = (1) /(sina)
证明:1/tana +sina/1+cosa =1/sina
(1) / (tana) + (sina) /(1+cosa) = (1) /(sina)
证明:1/tana +sina/1+cosa =1/sina(1) / (tana) + (sina) /(1+cosa) = (1) /(sina)
(sinα)^2=1-(cosα)^2==>(sinα)^2=(1+cosα)(1-cosα)==>sinα/(1+cos)=(1-cosα)/sinα,
∴cosα/sinα+(1-cosα)/sinα=1/sinα=右边,