/ / 8 16 \ / 8 \\
| | 78*x 648*x | | 12*x ||
36*x*|- 2*(1 + x)*|1 - --------- + ------------| + 3*x*|-1 + ---------||
| | 8 2| | 8||
| | -1 + 9*x / 8\ | \ -1 + 9*x /|
\ \ \-1 + 9*x / / /
------------------------------------------------------------------------
__________
/ 8
\/ 1 - 9*x
$$\frac{36 x \left(3 x \left(\frac{12 x^{8}}{9 x^{8} - 1} - 1\right) - 2 \left(x + 1\right) \left(\frac{648 x^{16}}{\left(9 x^{8} - 1\right)^{2}} - \frac{78 x^{8}}{9 x^{8} - 1} + 1\right)\right)}{\sqrt{1 - 9 x^{8}}}$$