>
>
>>>
> Yes, it does.  Our assumptions go through Maxima, and apparently assuming 
> a variable is complex does the job.
>
> sage: a = integrate(x*cos(x^3),(x,0,0.5)).n()
> sage: assume(x,'complex')
> sage: b = integrate(x*cos(x^3),(x,0,0.5)).n()
> sage: assumptions()
> [x is complex]
>

Actually,

sage: assume(x,'complex')
sage: integrate(x*cos(x^3),(x,0,0.5))
integrate(x*cos(x^3), x, 0, 0.5)

so the reason it works is because Maxima doesn't even evaluate it in the 
version of Maxima we have, so it goes straight to numerical integration 
with .n(). 

Anyway, upgrading our Maxima will take care of this integral.

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