find sum of n terms of series $\sum \cos(n\theta)$
5080
How can we sum up $\sin$ and $\cos$ series when the angles are in arithmetic progression?
68725
Find expression for : $ S_n =\sum_{i=1}^{n} \frac{i}{i^4+i^2+1} $
80177
Sum from $n=1$ to $N$ of $\sin(nx)/2^n$
17056
How to find answer to the sum of series $\sum_{n=1}^{\infty}\frac{n}{2^n} $
14883
Find $\sum_{n=1}^{\infty}$ $\frac{n^{2}}{\left(n+1\right)\left(n+2\right)\left(n+3\right)\left(n+4\right)}$
18796
How to find the sum of the series $1+\frac{1}{2}+ \frac{1}{3}+\frac{1}{4}+\dots+\frac{1}{n}$?
151189
calculate the sum of an infinite series
112036
sum of series $\frac{n}{1\cdot 2 \cdot 3}+\frac{n-1}{2\cdot 3\cdot 4}+\frac{n-2}{3\cdot 4 \cdot 5}+\cdots \cdots n$ terms
26491
Sum function of a series
113713
Closed formula for the sum of the following series
136066
Find the sum $\sum _{n=1}^{\infty }\left(\sqrt{n+2}-2\sqrt{n+1}+\sqrt{n}\right)$
71824
Finding the sum of the series $\frac{1}{1!}+\frac{1+2}{2!}+\frac{1+2+3}{3!}+ \ldots$
132613
Testing the series $\sum\limits_{n=1}^{\infty} \frac{1}{n^{k + \cos{n}}}$
133420
Computing the binomial series: $\binom{n}{2}\cdot2^2+\binom{n}{4}\cdot2^4+\binom{n}{6}\cdot2^6+\cdots+ \binom{n}{n}\cdot2^n$
4573
Explicitly finding the sum of $\arctan(1/(n^2+n+1))$
121554
Finding $\sum\frac{1}{2^n(n+1)}$
44649
Summing a series having a geometric component