Solution for $\sum_{i=0}^{n} \sin(\frac{i\pi}{2n})$?
5080
How can we sum up $\sin$ and $\cos$ series when the angles are in arithmetic progression?
42742
Is $\sum_{n=1}^\infty \frac{\sin(2n)}{1+\cos^4(n)}$ convergent?
29524
Formula for the sum $\sum_{i=2}^{n} \frac1{i^2-1}$
34637
Evaluating $\sum\frac{\sin(n)}{n^a}$
139221
Compute the series $\sum_{n=1}^{+\infty} \frac{1}{n^3\sin(n\pi\sqrt{2})}.$
145019
Prove that $\sum_{n=0}^\infty \frac{(-1)^n}{3n+1} = \frac{\pi}{3\sqrt{3}}+\frac{\log 2}{3}$
52987
$\sum_{n=-\infty}^{\infty}\frac{1}{(n+\alpha)^2}=\frac{\pi^2}{(\sin \pi \alpha)^2}$?
139297
Find the sign of $\int_{0}^{2 \pi}\frac{\sin x}{x} dx$
26446
Find the sum : $\displaystyle\sum_{i=0}^n \frac{2^i}{1+x^{2^{i}}}$
104319
Real solution of $(\cos x -\sin x)\cdot \bigg(2\tan x+\frac{1}{\cos x}\bigg)+2=0.$
78712
Prove that $\frac{1}{\sin^2 z } = \sum\limits_{n= -\infty} ^ {+\infty} \frac{1}{(z-\pi n)^2} $
137027
Find the value of $\sum_{n=0}^\infty\frac{1}{9n^2+9n+2}$
90030
What would be the value of $\sum\limits_{n=0}^\infty \frac{1}{an^2+bn+c}$
143753
Please help me to find the sum $\sum\limits_{n\geq1} \frac{\sin(nx)}{n^2}$
121554
Finding $\sum\frac{1}{2^n(n+1)}$
153989
How to evaluate the sum $\frac{1}{\sqrt{n}}+\frac{1}{\sqrt{2n}}+\cdots+\frac{1}{\sqrt{n^2}}$ when $n$ grows?
119552
Summing Finitely Many Terms of Harmonic Series: $\sum_{k=a}^{b} \frac{1}{k}$