Also, here's mine: http://www.wolframalpha.com/input/?i=%281-%28|x|-1%29^2%29^0...
http://www.wolframalpha.com/input/?i=polar%28x+%3D+%28y%29%2...
Also, here's mine: http://www.wolframalpha.com/input/?i=%281-%28|x|-1%29^2%29^0...