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.
1 + (sum sin(j * pi * x / 19), j = 1 to 18) = 0
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random