Just in case anyone is curious (and so that I’ll remember), the logo was made using only readily available software. GeoGebra provided the backbone of sketching a function (something like ) and the tangent at ‘point A’ and played with scaling until I got an image that I liked. I grabbed a screen-capture (alt+prtsc), pasted into Microsoft Paint, and cropped/zoomed. The title was added by inserting the image into Microsoft Word and then overlaying WordArt. I’m sure that this isn’t the most efficient means of creating a logo image, but I’m mostly self-taught and do not have any ‘fancier’ programs. I’ve used skills like these repeatedly to create images for presentations and such.