This is what I get with current cvs maxima:
(%i12) integrate(cos(x)^3/sin(x)^4,x);
(%o12) (3*sin(x)^2-1)/(3*sin(x)^3) ====> ok
(%i13) integrate(cos(x)^3/sin(x)^4,x,1,2);
Integral is divergent
-- an error. To debug this try debugmode(true);
I'm sure maxima could calculate the definite integral above in the past.
This output is from a document I wrote about one year ago:
(%i28) integrate(cos(x)^3/sin(x)^4,x,1,2);
1 1 1 1
(%o28) ------ - --------- - ------ + ---------
sin(2) 3 sin(1) 3
3 sin (2) 3 sin (1)
--
Mario Rodriguez Riotorto
www.biomates.net