// / -pi*I / pi*I\ pi*I / 5*pi*I\\ \
|| | ------ | ----| ---- | ------|| |
|| | / pi*I\ 3 | 3 | 3 | 3 || |
|| | 4*log\1 - x*e / 4*e *log\1 - x*e / 4*e *log\1 - x*e /| |
|| | ------------------ - -------------------------- - --------------------------| |
|| 3 |4 3*x 3*x 3*x | |
||-x *|-- - ----------------------------------------------------------------------------| |
|| | 3 3 | |
|| \x x / |
5 ||---------------------------------------------------------------------------------------- for And(x <= 1, x > -1)|
oo + x *|< 4 |
|| |
|| oo |
|| ____ |
|| \ ` |
|| \ n 3*n |
|| \ (-1) *x |
|| / ---------- otherwise |
|| / 1 + 3*n |
|| /___, |
\\ n = 1 /
$$x^{5} \left(\begin{cases} - \frac{x^{3} \left(- \frac{- \frac{4 e^{- \frac{i \pi}{3}} \log{\left(- x e^{\frac{i \pi}{3}} + 1 \right)}}{3 x} + \frac{4 \log{\left(- x e^{i \pi} + 1 \right)}}{3 x} - \frac{4 e^{\frac{i \pi}{3}} \log{\left(- x e^{\frac{5 i \pi}{3}} + 1 \right)}}{3 x}}{x^{3}} + \frac{4}{x^{3}}\right)}{4} & \text{for}\: x \leq 1 \wedge x > -1 \\\sum_{n=1}^{\infty} \frac{\left(-1\right)^{n} x^{3 n}}{3 n + 1} & \text{otherwise} \end{cases}\right) + \infty$$
oo + x^5*Piecewise((-x^3*(4/x^3 - (4*log(1 - x*exp_polar(pi*i))/(3*x) - 4*exp(-pi*i/3)*log(1 - x*exp_polar(pi*i/3))/(3*x) - 4*exp(pi*i/3)*log(1 - x*exp_polar(5*pi*i/3))/(3*x))/x^3)/4, (x <= 1)∧(x > -1)), (Sum((-1)^n*x^(3*n)/(1 + 3*n), (n, 1, oo)), True))