Hello. I'm new to sympy and took the tutorial today. But I noticed the 
following error. I'm glad to contribute to this project.
Where can I get resources to learn more about the sympy?

The following line produces erroneous output.
In [129]: tan(x).series(x,pi/2,10)

I have attached the screenshot of the output
 
tan(x) cannot be expanded about pi/2.
The idea is determining the interval of convergence. If the point specified 
for the expansion is out of this interval then throw an exception telling 
that the power series expansion doesn't exist about that point.

Thanks.


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