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If tan A = (1 - cos B)/(sin B), then wha...

If `tan A = (1 - cos B)/(sin B),` then what is `(2 tan A )/( 1 - tan ^(2) A )` equal to ?

A

`(tan B )//2`

B

`2 tan B`

C

`tan B`

D

`4 tan B`

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