Find $\frac{dy}{dx}$ for $y = \sin^{-1}\left(\frac{2x}{1+x^2}\right)$ where $|x| < 1$.

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

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