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Q18 Let f(x, y) = 2x y - 10r - y'. a What unit vector i maximizes the quantity Daf(-1, 3)? b Compute Daf(-1, 3)

Q18 Let f(x, y) = 2x y - 10r - y'. a What unit vector i maximizes the quantity Daf(-1, 3)? b Compute Daf(-1, 3) for the u you found in part a

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