The functions (x, y) = x 2 + y 2 and g(x, y) = x 2

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The functions ƒ(x, y) = x2 + y2 and g(x, y) = x2 − y2 both have a critical point at (0, 0). How is the behavior of the two functions at the critical point different?

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Calculus

ISBN: 9781319055844

4th Edition

Authors: Jon Rogawski, Colin Adams, Robert Franzosa

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