-6*acos(3*x)
-------------
__________
/ 2
\/ 1 - 9*x
$$- \frac{6 \operatorname{acos}{\left(3 x \right)}}{\sqrt{- 9 x^{2} + 1}}$$
/ 1 3*x*acos(3*x)\
-18*|--------- + -------------|
| 2 3/2|
|-1 + 9*x / 2\ |
\ \1 - 9*x / /
$$- 18 \cdot \left(\frac{3 x \operatorname{acos}{\left(3 x \right)}}{\left(- 9 x^{2} + 1\right)^{\frac{3}{2}}} + \frac{1}{9 x^{2} - 1}\right)$$
/ 2 \
| acos(3*x) 9*x 27*x *acos(3*x)|
54*|- ------------- + ------------ - ---------------|
| 3/2 2 5/2 |
| / 2\ / 2\ / 2\ |
\ \1 - 9*x / \-1 + 9*x / \1 - 9*x / /
$$54 \left(\frac{9 x}{\left(9 x^{2} - 1\right)^{2}} - \frac{27 x^{2} \operatorname{acos}{\left(3 x \right)}}{\left(- 9 x^{2} + 1\right)^{\frac{5}{2}}} - \frac{\operatorname{acos}{\left(3 x \right)}}{\left(- 9 x^{2} + 1\right)^{\frac{3}{2}}}\right)$$