On Sat, 7 Sep 2013 15:25:26 +0300
Georgi Guninski <gunin...@guninski.com> wrote:

<snip>
> btw, I get:
> 'sage.rings.complex_interval.ComplexIntervalFieldElement' object has
> no attribute 'cot'
> 
> when trying your |check| on this:
> 
> -arctan(cot(pi*x))/pi + 1/2 #fractional part of x

This is now #15179:

http://trac.sagemath.org/ticket/15179


Cheers,
Burcin

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