// / -pi*I / pi*I\ pi*I / 5*pi*I\\ \ // / -2*pi*I / 2*pi*I\ 2*pi*I / 4*pi*I\\ \
|| | ------ | ----| ---- | ------|| | || | ------- | ------| ------ | ------|| |
|| | / pi*I\ 3 | 3 | 3 | 3 || | || | 3 | 3 | 3 | 3 || |
|| | 4*log\1 - x*e / 4*e *log\1 - x*e / 4*e *log\1 - x*e /| | || | 4*log(1 - x) 4*e *log\1 - x*e / 4*e *log\1 - x*e /| |
|| | ------------------ - -------------------------- - --------------------------| | || | - ------------ - ----------------------------- - ----------------------------| |
|| 3 |4 3*x 3*x 3*x | | || 3 | 4 3*x 3*x 3*x | |
||-x *|-- - ----------------------------------------------------------------------------| | ||x *|- -- + -----------------------------------------------------------------------------| |
|| | 3 3 | | || | 3 3 | |
|| \x x / | || \ x x / |
5 ||---------------------------------------------------------------------------------------- for And(x <= 1, x > -1)| 5 ||----------------------------------------------------------------------------------------- for And(x >= -1, x < 1)|
x *|< 4 | + x *|< 4 |
|| | || |
|| oo | || oo |
|| ____ | || ____ |
|| \ ` | || \ ` |
|| \ n 3*n | || \ 3*n |
|| \ (-1) *x | || \ x |
|| / ---------- otherwise | || / ------- otherwise |
|| / 1 + 3*n | || / 1 + 3*n |
|| /___, | || /___, |
\\ n = 1 / \\ n = 1 /
$$x^{5} \left(\begin{cases} \frac{x^{3} \left(\frac{- \frac{4 \log{\left(1 - x \right)}}{3 x} - \frac{4 e^{- \frac{2 i \pi}{3}} \log{\left(- x e^{\frac{2 i \pi}{3}} + 1 \right)}}{3 x} - \frac{4 e^{\frac{2 i \pi}{3}} \log{\left(- x e^{\frac{4 i \pi}{3}} + 1 \right)}}{3 x}}{x^{3}} - \frac{4}{x^{3}}\right)}{4} & \text{for}\: x \geq -1 \wedge x < 1 \\\sum_{n=1}^{\infty} \frac{x^{3 n}}{3 n + 1} & \text{otherwise} \end{cases}\right) + x^{5} \left(\begin{cases} - \frac{x^{3} \left(- \frac{- \frac{4 e^{- \frac{i \pi}{3}} \log{\left(- x e^{\frac{i \pi}{3}} + 1 \right)}}{3 x} + \frac{4 \log{\left(- x e^{i \pi} + 1 \right)}}{3 x} - \frac{4 e^{\frac{i \pi}{3}} \log{\left(- x e^{\frac{5 i \pi}{3}} + 1 \right)}}{3 x}}{x^{3}} + \frac{4}{x^{3}}\right)}{4} & \text{for}\: x \leq 1 \wedge x > -1 \\\sum_{n=1}^{\infty} \frac{\left(-1\right)^{n} x^{3 n}}{3 n + 1} & \text{otherwise} \end{cases}\right)$$
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)) + x^5*Piecewise((x^3*(-4/x^3 + (-4*log(1 - x)/(3*x) - 4*exp(-2*pi*i/3)*log(1 - x*exp_polar(2*pi*i/3))/(3*x) - 4*exp(2*pi*i/3)*log(1 - x*exp_polar(4*pi*i/3))/(3*x))/x^3)/4, (x >= -1)∧(x < 1)), (Sum(x^(3*n)/(1 + 3*n), (n, 1, oo)), True))