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1. Consider the function f(x, y) = x + 2x y +3. (a) Determine f. (b) Assuming is a unit vector, give an expression

1. Consider the function f(x, y) = x + 2x y +3. (a) Determine f. (b) Assuming is a unit vector, give an expression for Du (7, 4), the directional derivative at the point (7,4) in the direction of . (c) For what direction vector u does the directional derivative D (7,4) reach its maximum value?

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