Question: Problem 4 Let r2+y2 if (x, y) (0, 0), if (T, y) (a) Find directional derivative of y) at (0, 0) in every direction.

Problem 4 Let r2+y2 if (x, y) (0, 0), if (T, y)

Problem 4 Let r2+y2 if (x, y) (0, 0), if (T, y) (a) Find directional derivative of y) at (0, 0) in every direction. (b) Show that f is not differentiable at (0, 0). (Hint: if f is differentiable at (0, 0), Df(0, 0) = V f (0, 0) u.)

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