Opened 7 years ago

Closed 7 years ago

Last modified 7 years ago

#8729 closed defect (duplicate)

simple integral using trig functions gives wrong answer

Reported by: jason Owned by: burcin
Priority: major Milestone: sage-duplicate/invalid/wontfix
Component: calculus Keywords:
Cc: kcrisman Merged in:
Authors: Reviewers:
Report Upstream: N/A Work issues:
Branch: Commit:
Dependencies: Stopgaps:

Description

See ​http://groups.google.com/group/sage-devel/browse_frm/thread/f82e24efdfe23b07/d9e563f086b1136d for a solution 

sage: a=sqrt((sin(t))^2 + (cos(t))^2)
sage: integrate(a, t, 0, 2*pi) # WRONG!
pi
sage: a.simplify_full().simplify_trig()
1
sage: integrate(a.simplify_full().simplify_trig(), t, 0, 2*pi)
2*pi

Change History (6)

comment:1 Changed 7 years ago by jason

It looks like this is fixed in maxima 5.21.0, so maybe we should just upgrade.

comment:2 Changed 7 years ago by jason

  • Cc kcrisman added

comment:3 Changed 7 years ago by jason

This is fixed in the maxima upgrade at #8731

comment:4 Changed 7 years ago by rlm

  • Resolution set to duplicate
  • Status changed from new to closed

comment:5 Changed 7 years ago by kcrisman

Note put on #8731 to check this with a doctest when that ticket is done.

comment:6 Changed 7 years ago by rlm

  • Milestone changed from sage-4.5 to sage-duplicate/invalid/wontfix
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