On Sun, 2011-05-15 at 16:55 +0000, Renzo Del Fabbro wrote:
>maxima
Maxima 5.23.2 http://maxima.sourceforge.net
using Lisp CLISP 2.44.1 (2008-02-23)
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(acos(cos(t)),t,0,%pi/2);
2
3 %pi
(%o1) - ------
8
(%i2)
tomdean