[Octave-bug-tracker] [bug #45507] acos returns different results on big input values

[Marco Caliari]

Follow-up Comment #9, bug #45507 (project octave):

@ Andrew

Thanks Andrew for converting my script into a working patch! Nice your trick
to avoid sqrt * sqrt. If I'm right, you check whether sqrt(one - x*x) ==
sqrt(-x*x) for which the square root is trivial. But your limit 1e18 is a bit
imprecise. Isn't it enough that fabs (re) > 2^27 or fabs (im) > 2^27? 

Marco

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