Evaluate $\prod_{i=1}^{89} \sin (i)$
18285
Prove that $\prod_{k=1}^{n-1}\sin\frac{k \pi}{n} = \frac{n}{2^{n-1}}$
12196
Calculate Laurent series for $1/ \sin(z)$
93427
Show that $\sum_{i=1}^{n} \frac {a_i}{1+a-a_i} + \prod_{i=1}^{n} {(1-a_i)} \leq 1$
57152
Solve $\sin x = 1 - x$
146221
Find the product $\prod_{n=1}^{\infty} (1+x^{2n-1}) $
122145
Evaluating Limit - $(1-(\cos x)^{\sin x})/(x^3)$
108010
Evaluating $\sum_{k=1}^{\infty}\left(\frac{\sin(tk)}{k}\right)^2$
43509
Evaluating $\sum_{n=1}^{\infty}\frac{(n-1)!}{\prod_{r=1}^{n}(x+r)}$ for $x\in\mathbb{R}^{+}$
140983
$ \tan 1^\circ \cdot \tan 2^\circ \cdot \tan 3^\circ \cdots \tan 89^\circ$
78033
Evaluating $\prod_{n=1}^{\infty}\left(1+\frac{1}{2^n}\right)$
22773
What is the limit of $\frac{\prod\mathrm{Odd}}{\prod\mathrm{Even}}?$
38949
How to Evaluate $\int e^{2x}\sin(3x)\ dx$?
38254
Trigonometry Olympiad problem: Evaluate $1\sin 2^{\circ} +2\sin 4^{\circ} + 3\sin 6^{\circ}+\cdots+ 90\sin180^{\circ}$
281
How one can prove $\prod_{k=1}^{n-1} (\cos\theta-\cos(k\pi/n)) = 2^{1-n}\sin(n\theta)\csc\theta$?
89523
Infinite product $(1+z)\prod_{n=1}^{+\infty}(1+z^{2^{n}})$
60182
Evaluate $\int\frac{1}{\sin(x-a)\sin(x-b)}\,dx$
142673
Evaluate $\tan^{2}(20^{\circ}) + \tan^{2}(40^{\circ}) + \tan^{2}(80^{\circ})$