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(d)/(dx ) [a Tan ^(-1) x + b log ((x-1)/...

`(d)/(dx ) [a Tan ^(-1) x + b log ((x-1)/(x +1)) ] = (1)/(x ^(4) - 1) implies a- 2b =`

A

1

B

-1

C

0

D

2

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The correct Answer is:
B
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