[Maxima] precision of bfloat functions

[Richard Fateman]

Sheldon Newhouse wrote:
> Hello,
>  Is it the case that the so-called intrinsic transcendental functions 
> (line exp, log, sin, etc) are accurate to the ulp in the various precisions?
>   

They are probably good to one ulp, but maybe off slightly.  Try them.  
Compute in precision n and then n+2
and see if they agree to precision n.

> Thanks for any info.
>
> -sen
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