Subject: Bug in changevar. Should I submit the bug report?
From: Robert Marik
Date: Thu, 22 Mar 2012 18:10:06 +0000 (UTC)
Raymond Toy <toy.raymond <at> gmail.com> writes:
> This is most likely a failure in solve.? I'm pretty sure changevar uses
> solve to express x in terms of t, and
> solve(t=cos(x)+sin(x),x) -> [sin(x) = t - cos(x)].
> ?
Reported a bug ID: 3510167
https://sourceforge.net/tracker
/?func=detail&aid=3510167&group_id=4933&atid=104933
>
> I don't follow here, but I guess you really meant cos(x)^(1/6)*sin(x),
> as your example shows.? This works because solve(t=cos(x),x) works.
>
No, it is suficient to change 6 into 1/6 and the computation is correct.
I added this computation to the bug report.
Thanks.
Robert Marik