//(6 + 3*x)*polylog(2, 6 + 3*x) \
||----------------------------- for 3*|2 + x| <= 1|
|| 3*(2 + x) |
|| |
|| oo |
|| ____ |
|| \ ` |
oo + |< \ n n |
|| \ 3 *(2 + x) |
|| ) ----------- otherwise |
|| / 2 |
|| / n |
|| /___, |
|| n = 1 |
\\ /
$$\begin{cases} \frac{\left(3 x + 6\right) \operatorname{Li}_{2}\left(3 x + 6\right)}{3 \left(x + 2\right)} & \text{for}\: 3 \left|{x + 2}\right| \leq 1 \\\sum_{n=1}^{\infty} \frac{3^{n} \left(x + 2\right)^{n}}{n^{2}} & \text{otherwise} \end{cases} + \infty$$
oo + Piecewise(((6 + 3*x)*polylog(2, 6 + 3*x)/(3*(2 + x)), 3*|2 + x| <= 1), (Sum(3^n*(2 + x)^n/n^2, (n, 1, oo)), True))