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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
  \   (-1)     *x     
  /   ----------------
 /       n*(n + 1)    
/___,                 
n = 1                 
$$\sum_{n=1}^{\infty} \frac{\left(-1\right)^{n + 1} x^{n + 1}}{n \left(n + 1\right)}$$
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