Problem 3 of 4 (6 pts). For each of the two vector fields below, nd a potential function f such that F = Vf. If this is impossible in any case, provide sufficient evidence/reasoning. Show each step of your work clearly, with explanations. F(x,y,z) = (cos y , sinx , tan 2) F(x,y,z) = (x, 93' sinz, 33' cos 2)