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.
((integrate abs(cos(x)) from 0 to 3pi/4 ))
((integrate abs(cos(x)) from 0 to 3pi/4 ))
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random