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Mon, 2 Apr 2007 09:21:21 -0500
As far as I know so far Axiom just uses the underlying lisp values
from cos and acos.
I don't consider it a bug but I don't consider it "stable" either.
All other values of all other functions seem to give the same
result and that result matches the input in this case. It's a
curious result though. I'd expect that they are using Chebyshev
polynomials and I'd have expected a symmetric result. Somebody
clearly "optimized" the world by saving an instruction somewhere.
The problem arose trying to explain a failing case in the
regression tests. Now that I understand it better it's not an issue.