मान लीजिए $y = \frac{1}{1 + x + \ln x}$. तो,

  • A
    $x \frac{dy}{dx} + y = x$
  • B
    $x \frac{dy}{dx} = y(y \ln x - 1)$
  • C
    $x^{2} \frac{dy}{dx} = y^{2} + 1 - x^{2}$
  • D
    $x \left(\frac{dy}{dx}\right)^{2} = y - x$

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