यदि $\int \frac{x^3}{\sqrt{1+x^2}} d x=A(1+x^2)^{\frac{3}{2}}+B(1+x^2)^{\frac{1}{2}}+C$ है,तो $A+B=$

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

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