#19791: tan(complex).imag() wrong
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Reporter: rws | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.0
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: Fixed upstream, in a later | Work issues:
stable release. | Commit:
Branch: | Stopgaps:
Dependencies: |
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Description changed by rws:
Old description:
> {{{
> sage: tan(2+I).n()
> -0.243458201185725 + 1.16673625724092*I
> sage: tan(2+I).imag().n()
> 0.0605381745356926
> sage: tan(2+I).imag()
> tanh(1)/(tan(2)^2*tan(1)^2 + 1)
> }}}
>
> There is a form that works at
> http://dlmf.nist.gov/4.21.E39
>
> See https://github.com/pynac/pynac/issues/114
New description:
{{{
sage: tan(2+I).n()
-0.243458201185725 + 1.16673625724092*I
sage: tan(2+I).imag().n()
0.0605381745356926
sage: tan(2+I).imag()
tanh(1)/(tan(2)^2*tan(1)^2 + 1)
}}}
There is a form that works at
http://dlmf.nist.gov/4.21.E39
See https://github.com/pynac/pynac/issues/114
Since this is fixed in Sage now, this ticket should provide doctests.
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Ticket URL: <http://trac.sagemath.org/ticket/19791#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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