Thanks to Jim Voss, aka mathguy for his original unit circle work at [url]http://www.geogebratube.org/student/m21362[/url] which I adapted to this. Thanks to Gregory Taylor, aka @mathtans, for the inspiration from his web serial at [url]https://sites.google.com/site/taylorspolynomials/specials/015-circeexplainstrigpart1[/url].
