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- d[v_Plus] := d /@ v;
- d[v_] := v /. {
- x_^n_?NumberQ :> n x^(n - 1) d[x],
- (n_?NumberQ^x_) :> Log[n] n^x d[x],
- x_ y__ :> d[x] y + d[y] x, n_?NumberQ :> 0, x :> 1
- }
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