Comment #1 on issue 3965 by [email protected]: sum of chebyshev polys
fails to evaluate
http://code.google.com/p/sympy/issues/detail?id=3965
For now, one can do at least the following:
In [10]: e.subs(x, 2).doit()
Out[10]: 10
(instead of .n()) -- this will give you analytic result. Only if you
want to evaluate the analytic result, like here:
In [13]: e.subs(x, pi).doit()
Out[13]:
2
π + 2⋅π
you can use .n():
In [14]: e.subs(x, pi).doit().n()
Out[14]: 22.8808014557685
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