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



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Solución

Ha introducido [src]
  oo                     
____                     
\   `                    
 \           2*n + 1     
  \         x            
  /   -------------------
 /    (2*n - 1)*(2*n + 1)
/___,                    
n = 1                    
$$\sum_{n=1}^{\infty} \frac{x^{2 n + 1}}{\left(2 n - 1\right) \left(2 n + 1\right)}$$
Sum(x^(2*n + 1)/(((2*n - 1)*(2*n + 1))), (n, 1, oo))
Respuesta [src]
  //   /       /        2\         \               \
  || 2 | 3     \-3 + 3*x /*atanh(x)|               |
  ||x *|---- + --------------------|               |
  ||   |   2              3        |               |
  ||   \2*x            2*x         /      | 2|     |
  ||--------------------------------  for |x | <= 1|
  ||               3                               |
  ||                                               |
  ||          oo                                   |
x*|<        ____                                   |
  ||        \   `                                  |
  ||         \        2*n                          |
  ||          \      x                             |
  ||           )  ---------             otherwise  |
  ||          /           2                        |
  ||         /    -1 + 4*n                         |
  ||        /___,                                  |
  ||        n = 1                                  |
  \\                                               /
$$x \left(\begin{cases} \frac{x^{2} \left(\frac{3}{2 x^{2}} + \frac{\left(3 x^{2} - 3\right) \operatorname{atanh}{\left(x \right)}}{2 x^{3}}\right)}{3} & \text{for}\: \left|{x^{2}}\right| \leq 1 \\\sum_{n=1}^{\infty} \frac{x^{2 n}}{4 n^{2} - 1} & \text{otherwise} \end{cases}\right)$$
x*Piecewise((x^2*(3/(2*x^2) + (-3 + 3*x^2)*atanh(x)/(2*x^3))/3, |x^2| <= 1), (Sum(x^(2*n)/(-1 + 4*n^2), (n, 1, oo)), True))

    Ejemplos de hallazgo de la suma de la serie