If cot A = [sin B/(1 - cos B)], then what is the value of co - Exam Yatra

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If cot A = [sin B/(1 - cos B)], then what is the value of cot 2A?

[2017 SSC CGL 16 AUG Shift 3]

A cot(B/2)

B cot 2B

C cot B

D tan B

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