Let f : R2 R be defined by f(x, y) = { x|y| / x2 + y2

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Let f : R2 →R be defined by
f(x, y) = { x|y| / √x2 + y2 (x, y) ≠ 0, 0 (x, y) =0.
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Calculus

ISBN: 978-0131429246

9th edition

Authors: Dale Varberg, Edwin J. Purcell, Steven E. Rigdon

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