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.
int 0 to pi/2 arccos(cos(x)/(1+2cos(x))
int 0 to pi/2 arccos(cos(x)/(1+2cos(x))
Natural Language
Math Input
Extended Keyboard
