$\int \frac{x^{n-1}}{x^{2n} + 4} dx =$

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

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