On Wednesday, June 28, 2017 at 4:42:22 AM UTC+2, François Bissey wrote:
>
> sage: q = RDF.pi()/3 
> sage: i = q.cos() 
> sage: q - i.arccos() 
> -2.220446049250313e-16 
>
>
sage: q - RDF(1/2).arccos()
-2.220446049250313e-16

on a gcc-based system. Not sure about relevance. 

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