$\int_0^\infty \frac{dx}{(x + \sqrt{x^2 + 1})^3} = $

  • A
    $\frac{3}{8}$
  • B
    $\frac{1}{8}$
  • C
    $-\frac{3}{8}$
  • D
    इनमें से कोई नहीं

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