polynomials of derivative operator
Is there any way in Sage to evaluate expressions such as p(x^2d/dx + a + x - x^2y) 1 where p() is a polynomial in one variable? The result would be a polynomial in a,x, and y.
Alternatively, can Sage evaluate (1/f) p(d/dx) f where f is a (non-polynomial) function of x and a and y?
Thanks very much.