Question: A function f(x, y) has partial derivatives f x (1, 2) = 3,f y (1, 2) = 5. Explain how you know that f does

A function f(x, y) has partial derivatives fx(1, 2) = 3,fy(1, 2) = 5. Explain how you know that f does not have a minimum at (1, 2).

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