यदि $\int \frac{x^3 \, dx}{\sqrt{1+x^2}} = a(1+x^2) \sqrt{1+x^2} + b \sqrt{1+x^2} + c$ (जहाँ $c$ समाकलन का एक स्थिरांक है),तो $3ab$ का मान ज्ञात कीजिए।

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

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