Question: Coefficients of differential polynomial

Hello everyone,


I am trying to extract the coefficients from a differential poynomial. In general, this poynomial is in two variables, say u and v along with their differentials, i.e D(u) or D@@2(u) or so on. 

Coefficients of this polynomials are rational funcitons.

For instance- consider the following example:


then output should be [a(x), 1, -1].


Thanks for your help.

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