$\int \frac{x}{\sqrt{4 - x^4}} \, dx = $

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

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