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8. (12pts) Given the function f (x, y) - In (3x2 + y?) a. Find the direction of maximum change of f (x, y )

8. (12pts) Given the function f (x, y) - In (3x2 + y?) a. Find the direction of maximum change of f (x, y ) at the point P(1, 1) b. Find the maximum value of the directional derivative of f (x, y) at P(1, 1)

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