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I don't get this one? 6. Let f (x, y) = x2 - xy + yz - y. Find the directions u and the values

I don't get this one?

6. Let f (x, y) = x2 - xy + yz - y. Find the directions u and the values of Duf (1, -1) for which (a) Duf (1, -1) is largest. (b) Df (1, -1) is smallest

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