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.
solve (atan(6y/(9-y**2)) + acotan((9-y**2)/(6*y)) = 2*pi/3)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random