The value of $ \int \frac{x^2 \, dx}{\sqrt{x^6 + a^6}} $ is equal to

Question

$ \log \left| x^3 + \sqrt{x^6 + a^6} \right| + C $

$ \log \left| x^3 - \sqrt{x^6 + a^6} \right| + C $

$ \frac{1}{3} \log \left| x^3 + \sqrt{x^6 + a^6} \right| + C $

$ \frac{1}{3} \log \left| x^3 - \sqrt{x^6 + a^6} \right| + C $

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