What is the value of $\cos\left(\frac{2\pi}{7}\right)$?
66872
Exact values of $\cos(2\pi/7)$ and $\sin(2\pi/7)$
25032
How to calculate $\theta = \arcsin\left(\frac{1}{2}\right)$ with given four function calculator?
139297
Find the sign of $\int_{0}^{2 \pi}\frac{\sin x}{x} dx$
11935
Is $\mathbb{Z} \left[ \frac{1+i \sqrt{7}}{2} \right]$ euclidean?
26814
Solve $\int \frac{1}{\sin ^{\frac{1}{2}}x \cos^{\frac{7}{2}}x}dx$
617
Find θ: $β=\arctan\frac{(R+r)·\sin(θ)-r·\sin(θ(1+\frac{R}{r}))}{(R+r)·\cos(θ)-r·\cos(θ(1+\frac{R}{r}))}$
48586
Prove: $\cot x=\sin x\,\sin\left(\frac{\pi}{2}-x\right)+\cos^2x\,\cot x$
115759
Evaluating this integral : $ \int \frac {1-7\cos^2x} {\sin^7x \cos^2x} dx $
56934
How do we prove $\cos(\pi/5) - \cos(2\pi/5) = 0.5$ ?.
131561
Find the value of $\left[\frac{1}{\sqrt 2}+\frac{1}{ \sqrt 3}+......+\frac{1}{\sqrt {1000}}\right]$
60491
Evaluate $ \int_{25\pi/4}^{53\pi/4}\frac{1}{(1+2^{\sin x})(1+2^{\cos x})}dx $
79044
Using the residue theorem, calculate $\int_{0}^{2\pi}\frac{1}{1-2a\cos{\theta}+a^2}d\theta$
7388
Evaluate: $\int_0^{\pi} \ln \left( \sin \theta \right) d\theta$
88989
Why $x<\tan{x}$ while $0<x<\frac{\pi}{2}$?
55128
Evaluation of $\sin \frac{\pi}{7}\cdot \sin \frac{2\pi}{7}\cdot \sin \frac{3\pi}{7}$
106828
If $0 \lt x \lt \frac{\pi}{2}$, is $\cos(x) \le \frac{\sin(x)}{x} \le \frac{1}{\cos(x)}$?
41191
How to prove this $\pi$ formula?