FYI, I found a very similar issue with "exp" and "log" for purely imaginary numbers:
http://pari.math.u-bordeaux.fr/cgi-bin/bugreport.cgi?bug=1896 Nathan -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
