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@dalias @kenshirriff Well, @steve deleted his hellsite acct, so context is missing.

https://x.com/cr1901/status/1601969347899133954

But according to my FF History, the correct way to do FP trig functions is arg reduce to +/-pi/4:

https://userpages.cs.umbc.edu/phatak/645/supl/Ng-ArgReduction.pdf

Then do a polynomial approx. Except I remember Steve saying the polynomial shouldn't be a Taylor series for some reason (slow convergence?).