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If piltthetalt2pi , then (1+costheta)/(1...

If `piltthetalt2pi` , then `(1+costheta)/(1-costheta)` is equal to `cos e ctheta+cottheta` b. `cos e ctheta-cottheta` c. ` cos e ctheta+cottheta` d. ` cos e ctheta-cottheta`

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Prove that: sqrt((1+costheta)/(1-costheta))=cos e ctheta+cottheta .

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