3*x
-------- + atan(3*x)
2
1 + 9*x
$$\frac{3 x}{9 x^{2} + 1} + \operatorname{atan}{\left(3 x \right)}$$
/ 2 \
| 9*x |
6*|1 - --------|
| 2|
\ 1 + 9*x /
----------------
2
1 + 9*x
$$\frac{6 \left(- \frac{9 x^{2}}{9 x^{2} + 1} + 1\right)}{9 x^{2} + 1}$$
/ 2 \
| 36*x |
54*x*|-4 + --------|
| 2|
\ 1 + 9*x /
--------------------
2
/ 2\
\1 + 9*x /
$$\frac{54 x \left(\frac{36 x^{2}}{9 x^{2} + 1} - 4\right)}{\left(9 x^{2} + 1\right)^{2}}$$