Cube root [HP-35]

[Gerson W. Barbosa]

(03-06-2020 09:50 AM)EdS2 Wrote:  I've a feeling we're using a truncated binary approximation to a third. Clever!

I only converted the method in the YouTube video to RPN. It took me a while to figure out what he meant by "ten cross", though :-)

Algorithms using square roots to approximate non-available functions might have been interesting when scientific calculators were not affordable. There was one for ln(x) which I managed to improve a bit. See here.