$\frac{d}{dx} \left( \sqrt{x} + \frac{1}{\sqrt{x}} \right)^2 = $

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

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