How do I evaluate $\cos(x) + \cos (2x) +\cos (3x) + ... + \cos (nx)$?
5080
How can we sum up $\sin$ and $\cos$ series when the angles are in arithmetic progression?
99584
Evaluation of $\int \frac{\sqrt{\sin ^4x+\cos ^4x}}{\sin ^3x \cos x }dx$
76129
Evaluate $\int_0^\infty\frac{\sin(\varphi_1x)}x\frac{\sin\varphi_2x}x\cdots\frac{\sin\varphi_nx}x\frac{\sin(ax)}x\cos(a_1x)\cdots\cos(a_mx) \, dx$
40235
How would I differentiate $\sin{x}^{\cos{x}}?$
38949
How to Evaluate $\int e^{2x}\sin(3x)\ dx$?
29604
How to solve $\sin x +\cos x = 1$?
87589
Evaluate $\binom{n}{0}+\binom{n}{2}+\binom{n}{4}+...+\binom{n}{2k}$
482
Express $1 + \frac {1}{2} \binom{n}{1} + \frac {1}{3} \binom{n}{2} + \dotsb + \frac{1}{n + 1}\binom{n}{n}$ in a simplifed form
11711
Prove trigonometry identity for $\cos A+\cos B+\cos C$
31448
Calculate $\int\left( \sqrt{\tan x}+\sqrt{\cot x}\right)dx$
39697
Integration of $e^{ax}\cos bx$ and $e^{ax}\sin bx$
117602
How to evaluate $\int \cot^2(x) \;\mathrm dx$?
118701
Evaluate $\int_{0}^{\frac{\pi }{2}}\frac{x dx}{\sin x +\cos x}$
13085
Evaluate $ 1 + \frac{1}{3}\frac{1}{4}+\frac{1}{5}\frac{1}{4^2}+\frac{1}{7}\frac{1}{4^3}+\dots$
122705
Solution of trigonometric equation $0 = x\cos(x)+2$
143428
How to sum $\sum_{x=0}^{N-1} \cos{\left( \frac{2\pi x}{N} \right)}^{2}$?
24808
How to evaluate the integral $\int \sqrt{1+\sin(x)} dx$