In what directions is the derivative of (x, y) = (x 2 - y 2 )/ (x

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In what directions is the derivative of ƒ(x, y) = (x2 - y2)/ (x2 + y2) at P(1, 1) equal to zero?

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Thomas Calculus Early Transcendentals

ISBN: 9780321884077

13th Edition

Authors: Joel R Hass, Christopher E Heil, Maurice D Weir

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