$\frac{d}{dx} \tan^{-1} \left( \frac{4\sqrt{x}}{1 - 4x} \right) = $

  • A
    $\frac{1}{\sqrt{x}(1 + 4x)}$
  • B
    $\frac{2}{\sqrt{x}(1 + 4x)}$
  • C
    $\frac{4}{\sqrt{x}(1 + 4x)}$
  • D
    इनमें से कोई नहीं

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