On Tuesday, July 22, 2014 2:04:01 AM UTC-7, Craig E Larson wrote: > > I am getting an error that I don't understand for the following definite > integral. > > sage: integral(sqrt(1+(9*cos(3*x)^2)),0,pi/2) > > This is definitely real on its domain and under the square-root is always > positive. Nevertheless, I get the error: > Maxima proper doesn't produce an error but doesn't do anything useful with the integral:
(%i1) display2d: false; (%o1) false (%i2) integrate(sqrt(1+cos(x)^2),x,0,%pi); (%o2) 'integrate(sqrt(cos(x)^2+1),x,0,%pi) but when we load abs_integrate (which sage does) the error occurs: (%i3) load(abs_integrate); (%o3) "/usr/local/sage/sage-6.0/local/share/maxima/5.29.1/share/contrib/integration/abs_integrate.mac" (%i4) integrate(sqrt(1+cos(x)^2),x,0,%pi); sign: argument cannot be imaginary; found %i One could consider reporting this upstream. On the plus side: it's not caused by `domain: complex` this time. -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
