Updates:
Cc: smichr
Comment #1 on issue 509 by asmeurer: Collecting expressions containing a
variable
http://code.google.com/p/sympy/issues/detail?id=509
What you want is now kind achieved by separatevars():
In [16]: separatevars(a*(cos(x)+sin(x)) + b*(cos(x)+sin(x)), symbols=(x))
Out[16]: (a + b)⋅(cos(x) + sin(x))
Although I think Chris was telling me the other day that he wanted to see a
function that would return something
more like (a + b)*cos(x) + (a + b)*sin(x) (or was that different Chris?).
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