5. (7 pts) Find all directions in which the directional derivative of f(x,y)=ye−xy is 1 at the point (0,2). [ Hint: If u
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5. (7 pts) Find all directions in which the directional derivative of f(x,y)=ye−xy is 1 at the point (0,2). [ Hint: If u
5. (7 pts) Find all directions in which the directional derivative of f(x,y)=ye−xy is 1 at the point (0,2). [ Hint: If u=⟨u1,u2⟩ is a unit vector, then u12+u22=1; what other relation between u1 and u2 does the directional derivative Duf(0,2) give?]
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