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"UnFullForm"ing an Expression?
I recently posted a query noting that if you enter the following f1[a_,x_] :=a Cos[x] + a^2 Sin[x] f2[a_,x_] := D[f1[a,x],x] you can make a Table[ ] of f1[a,x] but not of f2[a,x]. If I look at the FullForms for these, e.g. f1[a,x] // FullForm f2[a,x] // FullForm they both look like simple functions to me (i.e., f2[a,x] shows no visible memory of having originated from a derivative), except the f2 is inside a "FullForm[ ]" wrapper and f1 isn't. Is there a way to "UnFillForm" f2 ? If so, would f2 from then on act like f1 ? Does this query make any sense? I'd like to understand the situation here. Thanks siegman at ee.stanford.edu