Complex sum of sine and cosine functions
5080
How can we sum up $\sin$ and $\cos$ series when the angles are in arithmetic progression?
119552
Summing Finitely Many Terms of Harmonic Series: $\sum_{k=a}^{b} \frac{1}{k}$
101174
A closed form for a triple integral with sines and cosines
82391
Why does $\sum_{k=1}^{\infty}\frac{{\sin(k)}}{k}={\frac{\pi-1}{2}}$?
143857
How to prove absolute summability of sinc function?
138847
Tricky trigonometric sum evaluation
84846
Convergence of cos, sin, tan functions
9479
$\sum \cos$ when angles are in arithmetic progression
40556
Why is $\sin(\alpha+\beta)=\sin\alpha\cos\beta+\sin\beta\cos\alpha$
17188
Simplify $\cos(n \pi)$ and $\sin(n \pi)$ when n is an integer
1331
Approximation of the Sine function near $0$
66872
Exact values of $\cos(2\pi/7)$ and $\sin(2\pi/7)$
81825
Orthogonality of sine and cosine integrals.
122181
Application of Complex Numbers
27628
Solving $a \sin\theta + b \cos\theta = c$
124897
How many ways are there to define sine and cosine?
154065
$\int_{\frac{1}{3}\pi}^{\frac{2}{3}\pi} {\sin(x)\;dx}$ using Riemann sums?