$\int \frac{\tan ^{-1} x}{x^3} d x=$

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

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