#14723: Error when SymPy can't evaluate an integral
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Reporter: | Owner: burcin
eviatarbach | Status: needs_work
Type: defect | Milestone: sage-6.4
Priority: major | Resolution:
Component: calculus | Merged in:
Keywords: sympy, | Reviewers:
integrate | Work issues: handle definite integrals too
Authors: Eviatar | Commit:
Bach | Stopgaps:
Report Upstream: N/A |
Branch: |
Dependencies: |
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Changes (by {'newvalue': u'Eviatar Bach', 'oldvalue': ''}):
* keywords: => sympy, integrate
* work_issues: => handle definite integrals too
* author: => Eviatar Bach
Comment:
The original case is now working in sympy:
{{{
sage: integrate(sin(x)*tan(x), x, algorithm='sympy')
1/2*log(sin(x) + 1) - 1/2*log(sin(x) - 1) - sin(x)
}}}
so we need a more complicated one:
{{{
sage: integrate(sin(x)*tan(x)/(1-cos(x)), x, algorithm='sympy')
integrate(-sin(x)*tan(x)/(cos(x) - 1), x)
}}}
However, comment:7 is right regarding definite integrals:
{{{
sage: integrate(sin(x)*tan(x)/(1-cos(x)), x, a, b, algorithm='sympy')
integrate(-sin(x)*tan(x)/(cos(x) - 1), x)
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/14723#comment:13>
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