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.
plot 1/sqrt((4-x^2)^2+(0.5x)^2)cos(x-arctan(0.5x/(4-x^2))
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random