Question: How to make maple forget definitions

I have defined a function by doing


f:= (x1,x2,x3) -> sum( [complicated expression], [summation ranges]),


which Maple converts to an explicit polynomial in x1,x2,x3.


However, it seems Maple does not quite think of f as this polynomial, but always remembers the original definition of f. How should I do in order for Maple to really define f to be this explicit polynomial?



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