Hmm. In 5.9.1, ratsolve doesn't like that either:
(%i2) ratsolve(sqrt(h^2/a^2+k^2/b^2+l^2/c^2)^-1-d,a);
(%o2) []
CY
--- Richard Fateman wrote:
> I don't see documentation for ratsolve , but
> ratsolve apparently does not take an equation as first argument.
>
> ratsolve(a=1,a) gives a=0.
> ratsolve(a-1,a) gives a=1.
>
> RJF
> C Y wrote:
>
> > I don't know if this is a bug, local quirk, or what, but ratsolve
> seems
> > to be giving me a wrong answer here:
> >
> > Maxima 5.9.1.1cvs http://maxima.sourceforge.net
> > Using Lisp SBCL 0.8.20
> > (%i1) ratsolve(d=sqrt(h^2/a^2+k^2/b^2+l^2/c^2)^-1,a);
> > b c h
> > (%o1) [a = - ---------, a = 0]
> > b l + c k
> >
> > This is obviously nonsense because the solution doesn't even
> contain d.
> > Did I flub it up somehow? Can anyone reproduce this? Is it
> expected?
> >
> > CY
> >
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