ok i've this question:

$\displaystyle \int \frac{3x^2}{\sqrt{1-x^6}}$

I know that the answer is $\displaystyle sin^-1(x^3) + c$

I see the relationship between $\displaystyle sin^-1(x)$ and $\displaystyle sin^-1(x^3)$ and their integrals and this question...But what would be the best method to use to integrate and if it is substitution, what will u equal?

Thanks in advance!!