For each of the following vector fields, determine whether it is conservative and, if so, find a function f such that F = Vf. If the field is not conservative, enter N in the blank for the function f. (a) F (e-*)i + (xy) j : f (or N) = (b) F = (1 + 2xy)i + (x) j : f (or N) = (c) F = (-2x + y cos(xy))i + (x cos(xy)) j : f (or N) =

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