This bug has been reported at Sage forum http://groups.google.cz/group/sage-devel/t/c9c147c4dd4ea840
integrate(cos(x)^2 * (1 + sin(x)^2)^-3,x,0,%pi/2) returns a value wich is numericaly about 1.4.... but the correct value is close to 0.49
This is my bug_report(), but according to the discussion, the same problem is in the CVS version.
Maxima version: 5.18.1
Maxima build date: 13:5 5/3/2009
host type: i686-pc-linux-gnu
lisp-implementation-type: CMU Common Lisp
lisp-implementation-version: CVS 19d 19d-release (19D)
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