$\int e^{3 \log x}\left(x^4+1\right)^{-1} d x=$

  • A
    $e^{3 \log x}+c$
  • B
    $\frac{1}{4} \log \left(x^4+1\right)+c$
  • C
    $\frac{1}{3} \log \left(x^4+1\right)+c$
  • D
    $\frac{x^4}{x^4+1}$

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