Oscar,
Thanks for your very detailed reply.
However, I do wonder if inversions of integer matrices of increasing
size is the best test of the speed of SymPy vs another product.
Maybe some messy algebra is better. For example:
series(cos(k*x/(1-k*(1-k*x**2)/(1-x))),x,0,n)
Where n is successively replaced by
6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,etc might be a bit more realistic.
It might be best if the result is assigned to a variable so as to
exclude the cost of converting it to a string.
I am sure I am teaching my grandmother to suck eggs (not that either of
them ever did), but I hope you can see my point.
David
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