diff.pl

diff(x,1). diff(C, 0) :- atomic(C), C \= x. diff(F + G, DF + DG) :- diff(F, DF), diff(G, DG). diff(F - G, DF - DG) :- diff(F, DF), diff(G, DG). diff(F * G, DF * G + F * DG) :- diff(F, DF), diff(G, DG). diff(F / G, (DF * G - F * DG) / (G * G)) :- diff(F, DF), diff(G, DG).
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