A first place to look are several recent posts on this list:
http://groups.google.com/group/sage-support/browse_thread/thread/4ebe85b45a569ca2#
http://groups.google.com/group/sage-support/browse_thread/thread/2331d21117179c05
But feel free to post again if these do not give you good
workarounds!  Hopefully this issue will get fixed relatively soon...

- kcrisman

On Sep 8, 9:26 am, Francois Maltey <[email protected]> wrote:
> Hello,
>
> I discover sage and can't plot this second parametric curve :
>
> var("a")
> parametric_plot ((cos (a), sin (a)),(a,-5,5))   # is right
> parametric_plot ((real (e^(i*a)), imag(e^(i*a))),(a,-5,5))   # doesn't plot
>
> I also test it with the N function... I get the same error.
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