. Let n 2 3 be an odd number and f(a, y) = (x" + y")'/n. (a) Determine if f(x, y) is differentiable at (0,0). (b) Find all the points where f(x, y) is not differentiable. Justify your answer. (c) Find the unit vector(s) ũ € R² such that the directional derivative Daf(0,0) is minimum. (d) Compute or show that it does not exist. Əxðy

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