/ 2 3*x \
18*|- --------------------- + -------------|
| / 2\ 3/2|
| \-1 + 9*x /*acos(3*x) / 2\ |
\ \1 - 9*x / /
--------------------------------------------
2
acos (3*x)
$$\frac{1}{\operatorname{acos}^{2}{\left (3 x \right )}} \left(\frac{54 x}{\left(- 9 x^{2} + 1\right)^{\frac{3}{2}}} - \frac{36}{\left(9 x^{2} - 1\right) \operatorname{acos}{\left (3 x \right )}}\right)$$
/ 2 \
| 1 6 27*x 18*x |
54*|------------- + ------------------------ + ------------- + ----------------------|
| 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)/
--------------------------------------------------------------------------------------
2
acos (3*x)
$$\frac{1}{\operatorname{acos}^{2}{\left (3 x \right )}} \left(\frac{1458 x^{2}}{\left(- 9 x^{2} + 1\right)^{\frac{5}{2}}} + \frac{972 x}{\left(9 x^{2} - 1\right)^{2} \operatorname{acos}{\left (3 x \right )}} + \frac{54}{\left(- 9 x^{2} + 1\right)^{\frac{3}{2}}} + \frac{324}{\left(- 9 x^{2} + 1\right)^{\frac{3}{2}} \operatorname{acos}^{2}{\left (3 x \right )}}\right)$$