यदि $f(x) = \sin^{-1} \left( \frac{2x}{1 + x^2} \right)$ है, तो $f' \left( \frac{1}{2} \right) =$

  • A
    $\frac{8}{5}$
  • B
    $\frac{5}{8}$
  • C
    $\frac{4}{5}$
  • D
    $0$

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