$\int \frac{4 x^2 \cot ^{-1}\left(x^3\right)}{1+x^6} \,d x=$ (जहाँ $C$ समाकलन का एक स्थिरांक है।)

  • A
    $\frac{-2}{3}\left(\cot ^{-1} x^3\right)+C$
  • B
    $\frac{-2}{3}\left(\cot ^{-1} x^3\right)^2+C$
  • C
    $\frac{2}{3}\left(\cot ^{-1} x^3\right)+C$
  • D
    $\frac{2}{3}\left(\cot ^{-1} x^3\right)^2+C$

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