#20752: Wrong simplification in symbolic trigonometry involving fractions
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Reporter: tmonteil | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.3
Component: porting: Solaris | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by tmonteil:
Old description:
> As reported in [http://ask.sagemath.org/question/33623/bug-in-cos-
> function-in-version-72/?answer=33624#post-id-33624 this ask question],
> Sage makes wrong simplifications in symbolic trigonometry:
>
> {{{
> sage: cos(pi+pi*1/42)
> cos(1/42*pi)
> }}}
>
> While it should be `-cos(1/42*pi)`.
New description:
As reported in [http://ask.sagemath.org/question/33623/bug-in-cos-
function-in-version-72/?answer=33624#post-id-33624 this ask question],
Sage makes wrong simplifications in symbolic trigonometry involving
fractions:
{{{
sage: cos(pi+pi*1/42)
cos(1/42*pi)
}}}
While it should be `-cos(1/42*pi)`.
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Ticket URL: <http://trac.sagemath.org/ticket/20752#comment:5>
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