Let Using polar coordinates, prove that and that does not exist. Show that g(x, y) = cos

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Let f(x, y) =x/(x + y) and g(x, y) = x/(x + y). Using polar coordinates, prove that lim f(x,y)=0 (x,y)(0,0) and that lim g(x, y) (x,y)(0,0) does not exist. Show that g(x, y) = cos2θ and observe that cos θ can take on any value between −1 and 1 as (x, y) → (0, 0).

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Calculus

ISBN: 9781319055844

4th Edition

Authors: Jon Rogawski, Colin Adams, Robert Franzosa

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