Re: modify coord-rotate to get exact values for (sin PI) etc (issue 269530043 by address@hidden)

[Benkő Pál]

> And PostScript (and PDF and METAFONT) _do_ represent angles in degrees.
> So it's sort of silly that we cannot get an angle of 180 degrees
> straight into PostScript without change.

now that convinced me.  if we want to output angles in degrees, we
don't want to switch back and forth neither between degrees and
radians, nor between angles and sines.  at most one atan (acos) call
somewhere.

p