/ 2\
| 6 3 / 3\ 6 / 3\ |
| 9*x 18*x *\-1 + x / 27*x *\-1 + x / |
3*|2 + ------------- + --------------- + ----------------|
| 2 2 2|
| / 3\ / 3\ / 2\ |
| 1 - \1 - x / 1 - \1 - x / | / 3\ | |
\ \1 - \1 - x / / /
----------------------------------------------------------
_______________
/ 2
/ / 3\
\/ 1 - \1 - x /
$$\frac{3 \left(\frac{9 x^{6}}{1 - \left(1 - x^{3}\right)^{2}} + \frac{27 x^{6} \left(x^{3} - 1\right)^{2}}{\left(1 - \left(1 - x^{3}\right)^{2}\right)^{2}} + \frac{18 x^{3} \left(x^{3} - 1\right)}{1 - \left(1 - x^{3}\right)^{2}} + 2\right)}{\sqrt{1 - \left(1 - x^{3}\right)^{2}}}$$