Derivative of $\sin ^{-1}\left(\frac{2 x}{1+x^2}\right)$ with respect to $\tan ^{-1} x$ for $-1 < x < 1$ is:

  • A
    $2$
  • B
    $\frac{1}{1+x^2}$
  • C
    $\frac{2}{1+x^2}$
  • D
    $\frac{1}{2}$

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