On Fri, Jun 15, 2007 at 11:02:51PM -0400, Kamaraju S Kusumanchi wrote:
> Richard Fateman wrote:
>
> > ratsubst(q,x/D^2,a);
> > factor(%);
> > ratsubst(x/D^2,q,%);
> >
> > Does it. Gives
> > -(x/D-1)*(x/D+1)/(3*x/D+1)^4
...
> Doesnot seem to work. I am getting
>
> (%i4) ratsubst(x/D^2,q,%);
> 4 2 2
> D - x D
> (%o4) ------------------------------------------
> 4 3 2 2 3 4
> D + 12 x D + 54 x D + 108 x D + 81 x
if you replace the second ratsubst with subst(q=x/D^2,%) it works for
me.
--
Daniel Lakeland
dlakelan at street-artists.org
http://www.street-artists.org/~dlakelan