If is differentiable at (a, b) and x (a, b) = y (a, b)

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If ƒ is differentiable at (a, b) and ƒx(a, b) = ƒy(a, b) = 0, what can we conclude about the tangent plane at (a, b)?

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Calculus

ISBN: 9781319055844

4th Edition

Authors: Jon Rogawski, Colin Adams, Robert Franzosa

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