Consider the function f(x, y) 3-- 2 V Find Df(5, 5), where u = using each given vector v. (a) v i Duf(5, 5) (b) v -3i 4j Duf(5, 5) (c) v is the vector from (1, 2) to (-2, 6) Duf(5, 5) (d) v is the vector from (3, 2) to (4, 5). Duf(5, 5)

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