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Suma de la serie ((-1)^(n+1))*(x^(n+1)/(n*(n+1)))



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Solución

Ha introducido [src]
  oo                     
____                     
\   `                    
 \                 n + 1 
  \       n + 1   x      
  /   (-1)     *---------
 /              n*(n + 1)
/___,                    
n = 1                    
$$\sum_{n=1}^{\infty} \left(-1\right)^{n + 1} \frac{x^{n + 1}}{n \left(n + 1\right)}$$
Sum((-1)^(n + 1)*(x^(n + 1)/((n*(n + 1)))), (n, 1, oo))
Respuesta [src]
   //   /  2   (2 + 2*x)*log(1 + x)\               \
   ||-x*|- - + --------------------|               |
   ||   |  x             2         |               |
   ||   \               x          /               |
   ||--------------------------------  for |x| <= 1|
   ||               2                              |
   ||                                              |
   ||           oo                                 |
-x*|<         ____                                 |
   ||         \   `                                |
   ||          \        n  n                       |
   ||           \   (-1) *x                        |
   ||            )  --------            otherwise  |
   ||           /         2                        |
   ||          /     n + n                         |
   ||         /___,                                |
   \\         n = 1                                /
$$- x \left(\begin{cases} - \frac{x \left(- \frac{2}{x} + \frac{\left(2 x + 2\right) \log{\left(x + 1 \right)}}{x^{2}}\right)}{2} & \text{for}\: \left|{x}\right| \leq 1 \\\sum_{n=1}^{\infty} \frac{\left(-1\right)^{n} x^{n}}{n^{2} + n} & \text{otherwise} \end{cases}\right)$$
-x*Piecewise((-x*(-2/x + (2 + 2*x)*log(1 + x)/x^2)/2, |x| <= 1), (Sum((-1)^n*x^n/(n + n^2), (n, 1, oo)), True))

    Ejemplos de hallazgo de la suma de la serie