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