// / 1 log(1 - 4*x)\ \
||2*x*|- --- - ------------| for And(x >= -1/4, x < 1/4)|
|| | 2*x 2 | |
|| \ 8*x / |
|| |
|| oo |
|| ____ |
x*|< \ ` |
|| \ n n |
|| \ 4 *x |
|| / ----- otherwise |
|| / 1 + n |
|| /___, |
|| n = 1 |
\\ /
$$x \left(\begin{cases} 2 x \left(- \frac{1}{2 x} - \frac{\log{\left(1 - 4 x \right)}}{8 x^{2}}\right) & \text{for}\: x \geq - \frac{1}{4} \wedge x < \frac{1}{4} \\\sum_{n=1}^{\infty} \frac{4^{n} x^{n}}{n + 1} & \text{otherwise} \end{cases}\right)$$
x*Piecewise((2*x*(-1/(2*x) - log(1 - 4*x)/(8*x^2)), (x >= -1/4)∧(x < 1/4)), (Sum(4^n*x^n/(1 + n), (n, 1, oo)), True))