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 2*atan(0.5*0.487/x)*180/pi x(0.4;0.8)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
