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3. (35%) Consider the function f : R2 - R, given by f (x1, 2) = i+ 2x1X2 -2x7 - 621 (a) Find the first-

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3. (35%) Consider the function f : R2 - R, given by f (x1, 2) = i+ 2x1X2 -2x7 - 621 (a) Find the first- and second-order partial derivatives of f. (b) Find and classify the stationary points of f. (c) Does the Extreme Value Theorem imply that f has a global max- imum

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