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Prove that, SinA/(1-cosA) =CosecA+cotA...

Prove that, `SinA/(1-cosA) =CosecA+cotA`

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The correct Answer is:
C
For `alpha=-pi//2,beta=pi//2andgamma=2pi`
`sinalpha+sinbeta=singamma=-2`
Hence, the minimum value of the expression is negative.
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