Updates:
Status: Fixed
Comment #5 on issue 1623 by ondrej.certik: match doesn't exclude functions
http://code.google.com/p/sympy/issues/detail?id=1623
This patch is in already and the issue seems to be fixed now.
In [1]: notcos=Wild('notcos',exclude=[cos])
In [2]: cos(x).match(notcos)
In [3]:
In [4]: notx=Wild('notx',exclude=[x])
In [5]: cos(x).match(notx)
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