Sum of series $\sin \theta+\sin 2 \theta+\sin 3\theta+\dots$
104427
Sines and cosines of angles in arithmetic progression
113713
Closed formula for the sum of the following series
141645
Trigonometric series sum proof
150928
Summation of a trigonometric series - $\frac{\sin n}{n}$
114414
Sum of $\sum_{k=1}^n\sin{k\theta}$
100936
What is the sum of this series: $\frac{2}{\pi}\sum_{k=1}^{\infty}\frac{(-1)^{k-1}}{2k-1}$
122445
Sum of the series:$\frac{1}{1\cdot 2}+\frac{1\cdot3}{1\cdot2\cdot3\cdot4}+\cdots$
81102
Cosine of the sum of two solutions of trigonometric equation $a\cos \theta + b\sin \theta = c$
110975
Summation of reciprocals
31731
How to turn this into an equation and then sum the series?
55061
Evaluating the sum after reordering an infinite series $1-\frac {1} {2}+\frac {1} {3}-\frac {1} {4}+\ldots $
5080
How can we sum up $\sin$ and $\cos$ series when the angles are in arithmetic progression?
42424
Riemann sum of $\sin(x)$
7177
Find sum of series $ \sum_{n=1}^{\infty} (n\cdot \ln \frac{2n+1}{2n-1} - 1) $
130083
Evaluating sum of a combination series
35036
Series $\sum_{n=1}^{\infty}\frac{\cos(nx)}{n^2}$
83641
The sum of the series $\frac{15}{16}+\frac{15}{16} \times \frac{21}{24}+\frac{15}{16} \times \frac{21}{24} \times \frac{27}{32}+\dots$