This patch is revised with the comments mentioned regarding the v2 patch.
>From what I know, Guile treats inexact numbers with infinite precision and
>exact numbers as being equal,
e.g. (= 90.0 90) returns #t.
Unless there's an edge case, there likely doesn't need to be any special
handling for c
> atan(0,0) is not well-defined (more precisely, there is no unique choice
> within the interval [0,360°)) - if the point (0,0) is written in polar
> coordinates (0*cos theta, 0*sin theta), then any angle theta can be used.
>
>
> If you intend to support (arctan2 0 0), it may be good to mention
