Opened 2 years ago

Last modified 17 months ago

#24316 new defect

integrate gives wrong result when using maxima

Reported by: stassev Owned by:
Priority: major Milestone: sage-8.1
Component: symbolics Keywords:
Cc: Merged in:
Authors: Reviewers:
Report Upstream: N/A Work issues:
Branch: Commit:
Dependencies: Stopgaps:

Description

I'm using sage 8.0. Here is what I get:

sage: b,c,d=var('b c d')

sage: integrate(sqrt(b*cos(x)^2 + c*sin(x)^2 + 2*d*sin(x)*cos(x)), x, 0, 2*pi,algorithm='maxima')

-1/2*pi*b

That answer cannot possibly be correct, as the integrand is symmetric in b and c (you can substitute x with pi/2-x ...). Checking the answer numerically shows that it is indeed wrong.

Change History (2)

comment:1 Changed 2 years ago by stassev

  • Type changed from PLEASE CHANGE to defect

comment:2 Changed 2 years ago by rws

See also #18599, #18821, #24117.

Last edited 17 months ago by slelievre (previous) (diff)
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