Hi:
FYI, here is a bug recently discovered by a Sage user named Pong:
Maxima 5.16.3 http://maxima.sourceforge.net
Using Lisp CLISP 2.46 (2008-07-02)
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
The function bug_report() provides bug reporting information.
(%i1) integrate(x*abs(x^2-9),x,-6,0);
(%o1) 162
HTH, David Joyner