$$\frac{3}{9 x^{2} + 1}$$
-54*x
-----------
2
/ 2\
\1 + 9*x /
$$- \frac{54 x}{\left(9 x^{2} + 1\right)^{2}}$$
/ 2 \
| 36*x |
54*|-1 + --------|
| 2|
\ 1 + 9*x /
------------------
2
/ 2\
\1 + 9*x /
$$\frac{\frac{1944 x^{2}}{9 x^{2} + 1} - 54}{\left(9 x^{2} + 1\right)^{2}}$$