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