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

  • A
    $\frac{-2}{3}$
  • B
    $\frac{-1}{3}$
  • C
    $\frac{1}{3}$
  • D
    $\frac{2}{3}$

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