Is there a closed form for $\cos(\frac{\pi}5)$?
55179
How to find the exact value of $ \cos(36^\circ) $?
54735
What is the closed form of $\int e^{x^2} \, dx$?
127284
Closed form of $\int_0^{\pi/2} \frac{\arctan^2 (\sin^2 \theta)}{\sin^2 \theta}\,d\theta$
156597
Proving a reduction formula for the antiderivative of $\cos^n(x)$
12423
"Closed" form for $\sum \frac{1}{n^n}$
63943
Is $\tan(\pi/2)$ undefined or infinity?
106803
How to see $\cos x \leq \exp(-x^2/2)$ on $x \in [0,\pi/2]$?
17188
Simplify $\cos(n \pi)$ and $\sin(n \pi)$ when n is an integer
74143
Simplifying and evaluating $\cot 70^\circ+4\cos 70^\circ$
51845
PDF of $Y = \cos(\pi X)$
70390
is there a closed form expression for the following matrix infinite series
120953
Show that, $2\arctan\left(\frac{1}{3}\right)+2\arcsin\left(\frac{1}{5\sqrt2}\right)-\arctan\left(\frac{1}{7}\right)=\frac{\pi}{4}$
65645
Express $w$ and $\frac1w$ for $w=\frac {\sqrt2+\sqrt3}{\sqrt5-\sqrt3}$ in the simplest form with a rational denominator
141390
Closed form for $\sum_{n=-\infty}^\infty \frac{1}{(z+n)^2+a^2}$
121617
Closed form of $\sum_{n=0}^{\infty} \frac{\cos(\alpha \, n)}{n!}$
72036
Closed form of $\int_0^\infty \sin(x)\sin\left(\frac{1}{x}\right)dx$?
39659
Is there a closed formula for this summation?