જો $\int \frac{x^3 \, dx}{\sqrt{1+x^2}} = a(1+x^2) \sqrt{1+x^2} + b \sqrt{1+x^2} + c$ (જ્યાં $c$ એ સંકલનનો અચળાંક છે),તો $3ab$ ની કિંમત શોધો.

  • A
    $-3$
  • B
    $-1$
  • C
    $1$
  • D
    $3$

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