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Mathematics 23 Online
OpenStudy (anonymous):

Assume ∇f(x, y) ≠ 0. Show that Duf(x, y) is (a.) largest when u = ∇f(x, y) |∇f (x, y)| and (b.) smallest when u = − ∇f(x,y) . |∇f (x, y)|

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