Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
\cos\left(2\pi-10\cdot \arccos\left(\sqrt{\frac{1}{2}+\frac{\sqrt{5}}{6}} \right)\right)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random