Comment #4 on issue 3700 by t.hi...@gmail.com: 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
I've just verified that
In [11]: r/pi*integrate((cos(n*(x-phi))*cos(n*x)).expand(trig=True), (x,
-pi, pi))
Out[11]: r⋅cos(n⋅φ)
worked with the sympy version from march as well.
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