How do I find the value $(1+\tan1^\circ)(1+\tan2^\circ)(1+\tan3^\circ)\cdots(1+\tan45^\circ)$
32183
A "fast" way for  computing $ \prod \limits_{i=1}^{45}(1+\tan i^\circ) $?
76941
How do you find the value of $\sum_{r=0}^{44} \tan^2(2r+1)$?
54512
How do I prove: $\cos (\theta + 90^\circ) \equiv - \sin \theta $
122948
$x^{x^{x^{\dots}}}=2$, what is the value of $x$?
111601
Evaluating $\int \tan^{1/3}(\theta) d \theta$
14306
What is the formula for $\frac{1}{1\cdot 2}+\frac{1}{2\cdot 3}+\frac{1}{3\cdot 4}+\cdots +\frac{1}{n(n+1)}$
129319
Weird "hidden answer" in $2\tan(2x)=3\text{cot}(x)$
9539
$\alpha$ and $\beta$ are solution of $a \cdot \tan\theta + b \cdot \sec\theta = c$ show $ \tan(\alpha + \beta) = \frac{2ac}{a^2 - c^2}$
128415
Prove that $1<\frac{1}{1001}+\frac{1}{1002}+\frac{1}{1003}+\dots+\frac{1}{3001}<\frac43$
151179
Finding the value of $\sum k/3^k$
74120
Find the value of $\sum_{n=1}^{\infty} \frac{2}{n}-\frac{4}{2n+1}$
23726
A closed form for $1^{2}-2^{2}+3^{2}-4^{2}+ \cdots + (-1)^{n-1}n^{2}$
47706
Find the value of $ \sum_{n=1}^{\infty} \frac{n^3}{3^n} $
99328
Value of $\sin (2^\circ)\cdot \sin (4^\circ)\cdot \sin (6^\circ)\cdots \sin (90^\circ) $
23576
Calculating $1+\frac13+\frac{1\cdot3}{3\cdot6}+\frac{1\cdot3\cdot5}{3\cdot6\cdot9}+\frac{1\cdot3\cdot5\cdot7}{3\cdot6\cdot9\cdot12}+\dots? $
30600
Why does $\tan^{-1}(1)+\tan^{-1}(2)+\tan^{-1}(3)=\pi$?
103144
Is there a way to write this expression differently: $\arctan 1/(1+n+n^2)$?