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Suma de la serie x^(n+1)/((2n-1)(2n+1))



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Solución

Ha introducido [src]
  oo                     
____                     
\   `                    
 \            n + 1      
  \          x           
  /   -------------------
 /    (2*n - 1)*(2*n + 1)
/___,                    
n = 2                    
$$\sum_{n=2}^{\infty} \frac{x^{n + 1}}{\left(2 n - 1\right) \left(2 n + 1\right)}$$
Sum(x^(n + 1)/(((2*n - 1)*(2*n + 1))), (n, 2, oo))
Respuesta [src]
  //   /                               /  ___\\              \
  || 2 |15/2 - 5*x   (-15 + 15*x)*atanh\\/ x /|              |
  ||x *|---------- + -------------------------|              |
  ||   |     2                    5/2         |              |
  ||   \    x                  2*x            /              |
  ||-------------------------------------------  for |x| <= 1|
  ||                     15                                  |
  ||                                                         |
  ||                oo                                       |
x*|<              ____                                       |
  ||              \   `                                      |
  ||               \         n                               |
  ||                \       x                                |
  ||                 )  ---------                 otherwise  |
  ||                /           2                            |
  ||               /    -1 + 4*n                             |
  ||              /___,                                      |
  ||              n = 2                                      |
  \\                                                         /
$$x \left(\begin{cases} \frac{x^{2} \left(\frac{\frac{15}{2} - 5 x}{x^{2}} + \frac{\left(15 x - 15\right) \operatorname{atanh}{\left(\sqrt{x} \right)}}{2 x^{\frac{5}{2}}}\right)}{15} & \text{for}\: \left|{x}\right| \leq 1 \\\sum_{n=2}^{\infty} \frac{x^{n}}{4 n^{2} - 1} & \text{otherwise} \end{cases}\right)$$
x*Piecewise((x^2*((15/2 - 5*x)/x^2 + (-15 + 15*x)*atanh(sqrt(x))/(2*x^(5/2)))/15, |x| <= 1), (Sum(x^n/(-1 + 4*n^2), (n, 2, oo)), True))

    Ejemplos de hallazgo de la suma de la serie