Status: New
Owner: ----
Labels: Type-Defect Priority-Medium Integration
New issue 3700 by [email protected]: integration of cos(n*(x-phi))*cos(n*x)
from x=-pi..pi does not work
http://code.google.com/p/sympy/issues/detail?id=3700
from sympy import *
r, x, phi = symbols('r x phi')
n = symbols('n', integer=True, positive=True)
r/pi*integrate(cos(n*(x-phi))*cos(n*x), (x, -pi, pi))
The integrate method is not able to evaluate the above integral for
positive n's. If I substitute n with positive integers then integrate is
able to perform the integration.
The expected output of the above integral is
r * cos(n*phi)
I would like to fix this if it's not too difficult. Where should I look at
in the sympy code ?
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