I've tried this on my 4.6 sage and on 5.0 beta; the main sagenb.org is not
returning calculations for me. Both 4.6 and 5.0 have the same error. This
double integral calculation is correct:
var("r t")
f=integral(sqrt(1-r^2*cos(t)^2)*r,r,0,1)
g=integral(f,t)
g; g(t=pi/4)-g(t=0)
but this one is not:
integral(f,t,0,pi/4)
Worksheet at http://test.sagenb.org/home/pub/36/
-- David
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