$\int \frac{dx}{x^2(x^4 + 1)^{3/4}} = $

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

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