/ / / x\\
| | 18*log|1 - -||
| | 6 \ 3/|
|x*|- - - -------------|
| | x 2 |
| \ x /
|----------------------- for And(x >= -3, x < 3)
| 6
|
< oo
| ____
| \ `
| \ -n n
| \ 3 *x
| / ------ otherwise
| / 1 + n
| /___,
| n = 1
\
$$\begin{cases} \frac{x \left(- \frac{6}{x} - \frac{18 \log{\left(1 - \frac{x}{3} \right)}}{x^{2}}\right)}{6} & \text{for}\: x \geq -3 \wedge x < 3 \\\sum_{n=1}^{\infty} \frac{3^{- n} x^{n}}{n + 1} & \text{otherwise} \end{cases}$$
Piecewise((x*(-6/x - 18*log(1 - x/3)/x^2)/6, (x >= -3)∧(x < 3)), (Sum(3^(-n)*x^n/(1 + n), (n, 1, oo)), True))