यदि $y\sqrt{x^2 + 1} = \log \{\sqrt{x^2 + 1} - x\}$ है,तो $(x^2 + 1)\frac{dy}{dx} + xy + 1 = $

  • A
    $0$
  • B
    $1$
  • C
    $2$
  • D
    इनमें से कोई नहीं

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