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.
(7*x/4+1/2) - (5*x/4+1/2)*cos(PI*x) for x=3
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
