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.
d/dy (r+sqrt( r^2 - 4*( r^2 - 3r^2/(4 sin^2(y/2)) ) ))/2
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random