$\frac{d}{d x}\left[a \tan ^{-1} x+b \log \left(\frac{x-1}{x+1}\right)\right]=\frac{1}{x^4-1}$
$\Rightarrow a-2 b$ ની કિંમત શોધો.

  • A
    $1$
  • B
    $-1$
  • C
    $0$
  • D
    $2$

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