Comment #2 on issue 4470 by [email protected]: freetype.cc: solve
algebra puzzle for converting quadratics to cubics
https://code.google.com/p/lilypond/issues/detail?id=4470
Yes, this is a well known formula. I can imagine that someone uses a more
complicated approach to avoid the divisions by three for speed reasons, but
the old lilypond code doesn't do that, so your simplification is fully
justified.
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