Find the sum of the following series using
68725
Find expression for : $ S_n =\sum_{i=1}^{n} \frac{i}{i^4+i^2+1} $
121554
Finding $\sum\frac{1}{2^n(n+1)}$
35036
Series $\sum_{n=1}^{\infty}\frac{\cos(nx)}{n^2}$
43903
Find the sum for $\sum_{n=1}^{\infty}(-1)^{(n+1)}\frac{2n+1}{3^n} $
81589
Find the sum of $\sum_{k=0}^{\infty} 1/[(r+2k+2)(s+2k+2)]$
148883
Sum of the series $\frac{1}{2\cdot 4}+\frac{1\cdot3}{2\cdot4\cdot6}+\dots$
107433
Prove the sum to n terms of the series
117843
Finding the sum of series $\sum_{n=0}^∞ \frac{2^n + 3^n}{6^n}$
127189
sum of this series: $\sum_{n=1}^{\infty}\frac{1}{4n^2-1}$
51146
Sum of Infinite Series $1 + 1/2 + 1/4 + 1/16 + \cdots$
107270
Calculate the following series using telescoping
37771
Sum of a power series $n x^n$
104078
Calculate the sum of the infinite series $\sum_{n=0}^{\infty} \frac{n}{4^n}$
155250
Summation Series for fractions
30895
Compute the sum of the series $\sum_{n=1}^{\infty} \frac{1}{n \cdot 2^n}$
113189
Find the sum of the series $1^2-2^2+3^2-4^2+...-(2n)^2$
94871
Sum of an unorthodox infinite series