Question: Let (, ) = 3 + 23 + 42 + 3. Find the unit direction(s) in which (a) (, ) has the maximum rate of

Let (, ) = 3 + 23 + 42 + 3. Find the unit direction(s) in which (a) (, ) has the maximum rate of change at (1, 2); (b) (, ) has the minimum rate of change at (1, 2); (c) (, ) has zero rate of change at (1, 2). For parts (a) and (b), find the corresponding rates of change of at the point (1, 2)

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