Computing a trigonometric sum
913
Evaluating $\sum_{n=0}^{\infty}{\sin^{3}\left(3^{n}\right) \over 3^{n}}$
6634
Evaluate trigonometric function
146746
A formula for the sum of the triangular numbers?
62450
Computing $ \int_0^{2\pi} \frac{1}{a^2\cos^2 t+b^2 \sin^2 t} dt \;; a,b>0$.
89003
Finding a trigonometric polynomial
69478
Deducing a $\cos (kx)$ summation from the $e^{ikx}$ summation
27513
Trigonometric bounds
129734
Computing $\sum_{k=1}^{\infty}\frac{1}{k}\int_{\pi k}^{\infty}\frac{\sin(x)}{x}dx$
84846
Convergence of cos, sin, tan functions
104427
Sines and cosines of angles in arithmetic progression
32183
A "fast" way for  computing $ \prod \limits_{i=1}^{45}(1+\tan i^\circ) $?
63064
How to compute sum of sum (linear analysis)
44649
Summing a series having a geometric component
150928
Summation of a trigonometric series - $\frac{\sin n}{n}$
153283
Trigonometric Integral Using Residue Theorem
96367
Intuition of Addition Formula for Sine and Cosine
81102
Cosine of the sum of two solutions of trigonometric equation $a\cos \theta + b\sin \theta = c$