Quoting Michael Forbes <miforbes@...734...>:
Since LaTeX only does quadratic is it possible for Inkscape to convert from cubic to quadratic since I am working on export?
Ohh.
Hmm. We don't currently have any code to do that, no.
Converting from quadratic to cubic is easy, as any quadratic curve is also (in a degenerate sense) a cubic curve, and you can do some simple math to convert the single control point of the quadratic bezier into the two control points points of a cubic bezier.
Going the other way is a bit harder, since most cubic curves are not directly representable as quadratic ones -- you have to subdivide the cubic curve and approximate pieces of it with quadratic sections.
You may find this link helpful:
http://www.timotheegroleau.com/Flash/articles/cubic_bezier_in_flash.htm
-mental