Let f be a function of two variables that has continuous partial derivatives and consider the points

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Let f be a function of two variables that has continuous partial derivatives and consider the points A(1, 3), B(3, 3), C(1, 7), and D(6, 15). The directional derivative of f at A in the direction of the vector AB(vector) is 3, and the directional derivative at A in the direction of AC(vector) is 26. Find the directional derivative of f at A in the direction of the vector AD(vector).

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Calculus Early Transcendentals

ISBN: 9781337613927

9th Edition

Authors: James Stewart, Daniel K. Clegg, Saleem Watson, Lothar Redlin

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