Missing functions tanPi, asinPi and acosPi

[Michel Hack <hack@xxxxxxxxxxxxxx>]

I wrote:
> > Could it be that they were thought to be easily-derivable
> > from the others?  Perhaps they are -- except for single-rounding

Thorsten Siebenborn replied:
> They are not.
>
> Any trig functions using pi violate either correct rounding or
> correct range reduction.  ...
>
> Moreover the normal trig functions made it impossible to exactly
> specify fractions of the full angle: half angle, right angle, ...

I did not mean to derive trigPi from plain trig or vice versa, but to
derive the missing trigPi functions from the other trigPi functions.

Michel.
Sent: 2008-04-11 19:47:42 UTC