-9
--------------
___________
/ 2
\/ 1 - 81*x
$$- \frac{9}{\sqrt{- 81 x^{2} + 1}}$$
-729*x
--------------
3/2
/ 2\
\1 - 81*x /
$$- \frac{729 x}{\left(- 81 x^{2} + 1\right)^{\frac{3}{2}}}$$
/ 2 \
| 243*x |
-729*|1 + ---------|
| 2|
\ 1 - 81*x /
--------------------
3/2
/ 2\
\1 - 81*x /
$$- \frac{\frac{177147 x^{2}}{- 81 x^{2} + 1} + 729}{\left(- 81 x^{2} + 1\right)^{\frac{3}{2}}}$$