2
3*(x + 1)
(2 + 2*x)*atan(3*x) + ----------
2
1 + 9*x
$$\frac{3 \left(x + 1\right)^{2}}{9 x^{2} + 1} + \left(2 x + 2\right) \operatorname{atan}{\left(3 x \right)}$$
/ 2 \
|6*(1 + x) 27*x*(1 + x) |
2*|--------- - ------------- + atan(3*x)|
| 2 2 |
| 1 + 9*x / 2\ |
\ \1 + 9*x / /
$$2 \left(- \frac{27 x \left(x + 1\right)^{2}}{\left(9 x^{2} + 1\right)^{2}} + \frac{6 \left(x + 1\right)}{9 x^{2} + 1} + \operatorname{atan}{\left(3 x \right)}\right)$$
/ / 2 \\
| 2 | 36*x ||
| 3*(1 + x) *|-1 + --------||
| | 2||
| 18*x*(1 + x) \ 1 + 9*x /|
18*|1 - ------------ + --------------------------|
| 2 2 |
\ 1 + 9*x 1 + 9*x /
--------------------------------------------------
2
1 + 9*x
$$\frac{18 \left(- \frac{18 x \left(x + 1\right)}{9 x^{2} + 1} + \frac{3 \left(x + 1\right)^{2} \left(\frac{36 x^{2}}{9 x^{2} + 1} - 1\right)}{9 x^{2} + 1} + 1\right)}{9 x^{2} + 1}$$