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I am having some trouble with these questions, Thank you so much in advance A) Suppose that ? f (1,2) = . Find a unit

I am having some trouble with these questions, Thank you so much in advance

A) Suppose that? f (1,2) = . Find a unit vector u such thatDu?f(1,2) is maximized, and find the maximum value

B) Find a unit vector u such thatDu?f(1,2) = 0

Evaluate the following limits

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