Sum up trigonometric series
9479
$\sum \cos$ when angles are in arithmetic progression
34590
Fourier series of Log sine and Log cos
150928
Summation of a trigonometric series - $\frac{\sin n}{n}$
78101
Does $\sum\frac{\sin n}{n}$ converge?
42424
Riemann sum of $\sin(x)$
122445
Sum of the series:$\frac{1}{1\cdot 2}+\frac{1\cdot3}{1\cdot2\cdot3\cdot4}+\cdots$
150355
Finding sum of binomial series
155951
Harmonic series sum approximation
147886
Proof of the angle sum identity for $\sin$
143112
Series Summation,Convergence
95739
Sum of tangent functions where arguments are in specific arithmetic series
44649
Summing a series having a geometric component
30480
Continued product in $\sin$ series
95786
Sum $\frac{1}{6} + \frac{5}{6\cdot 12} + \frac{5\cdot 8}{6\cdot 12\cdot 18} + \frac{5\cdot 8\cdot 11}{6\cdot 12\cdot 18\cdot 24}+\ldots$
118456
Find $\sum_{n=1}^{\infty}\tan^{-1}\frac{2}{n^2}$
913
Evaluating $\sum_{n=0}^{\infty}{\sin^{3}\left(3^{n}\right) \over 3^{n}}$
138172
Find the sum to n terms of the series $\frac{1}{1.2.3}+\frac{3}{2.3.4}+\frac{5}{3.4.5}+\frac{7}{4.5.6}+\cdots$..