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) (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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Authors: Samuel B Green, Neil J Salkind
6th Edition
0205893074, 9780205893072
