I just tried the problem in Maxima 5.40.0 ; the result is correct as I 
assume
Emmanuel also discovered.  The "fix" suggested by the poster of Trac#28431
(to divert some class of integral problems to sympy) does not strike me
as plausible.
Maybe something about Sage parsing of a minus sign??
RJF


On Wednesday, November 20, 2019 at 10:46:22 AM UTC-8, Emmanuel Charpentier 
wrote:
>
> I may be wrong, but a bit of exploration of Trac#28431 
> <https://trac.sagemath.org/ticket/28431>, which seemed fairly innocuous, 
> may demonstrate a basic failure in *our interface* to Maxima, which is, 
> IMHO, more severe than a bug in Maxima...
> I also checkef that's not a side effect of the domain:complex setup...
> A look by someone who knows what he's doing in this region of Sage may be 
> worthy...
>

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