/ 1 6*x \
9*|--------------------- - -------------|
|/ 2\ 3/2|
|\-1 + 9*x /*acos(3*x) / 2\ |
\ \1 - 9*x / /
-----------------------------------------
___________
4*\/ acos(3*x)
$$\frac{9 \left(- \frac{6 x}{\left(1 - 9 x^{2}\right)^{\frac{3}{2}}} + \frac{1}{\left(9 x^{2} - 1\right) \operatorname{acos}{\left(3 x \right)}}\right)}{4 \sqrt{\operatorname{acos}{\left(3 x \right)}}}$$
/ 2 \
| 4 3 108*x 18*x |
-27*|------------- + ------------------------ + ------------- + ----------------------|
| 3/2 3/2 5/2 2 |
|/ 2\ / 2\ 2 / 2\ / 2\ |
\\1 - 9*x / \1 - 9*x / *acos (3*x) \1 - 9*x / \-1 + 9*x / *acos(3*x)/
---------------------------------------------------------------------------------------
___________
8*\/ acos(3*x)
$$- \frac{27 \left(\frac{108 x^{2}}{\left(1 - 9 x^{2}\right)^{\frac{5}{2}}} + \frac{18 x}{\left(9 x^{2} - 1\right)^{2} \operatorname{acos}{\left(3 x \right)}} + \frac{4}{\left(1 - 9 x^{2}\right)^{\frac{3}{2}}} + \frac{3}{\left(1 - 9 x^{2}\right)^{\frac{3}{2}} \operatorname{acos}^{2}{\left(3 x \right)}}\right)}{8 \sqrt{\operatorname{acos}{\left(3 x \right)}}}$$