Comment #2 on issue 3122 by [email protected]: coeff wish list http://code.google.com/p/sympy/issues/detail?id=3122
in https://github.com/sympy/sympy/pull/1280
(3*a*(x + 1)**2 + sin(a)*x**2*y - y**2*x + x - a).multinomial_coeff(x)
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