Finding sum of residues of a rational function
101704
sum of the residue at all poles of the rational function p/q is 0.
26491
Sum function of a series
116822
Finding the next rational number
155439
How can I calculate this Riemann sum?
67271
$\sum_{n=-\infty}^{\infty}\frac{1}{(u +n)^2}=\frac{\pi^2}{(\sin \pi u)^2}$
18796
How to find the sum of the series $1+\frac{1}{2}+ \frac{1}{3}+\frac{1}{4}+\dots+\frac{1}{n}$?
121554
Finding $\sum\frac{1}{2^n(n+1)}$
32355
How to find the sum of the sequence $\frac{1}{1+1^2+1^4} +\frac{2}{1+2^2+2^4} +\frac{3}{1+3^2+3^4}+.....$
23112
Solving an equation with rational expressions (step by step)
22657
How to find the sum of the infinite series?
86051
Find the sum of reciprocals of divisors given the sum of divisors
29170
Find the sum of the series $\sum \frac{1}{n(n+1)(n+2)}$
50606
Find $\sum\limits_{k\, \text{ odd}} \frac{2(k^2-1)}{k^4+k^2+1}$
74891
sum of holomorphic functions
127806
How to find the sum of the series $\sum_{k=2}^\infty \frac{1}{k^2-1}$?
4742
Find the poles and residue of the function $\frac{1}{z-\sin z }$ at $z=0$?
101835
Which rationals can be written as the sum of two rational squares?