What is the rate of change of (x, y) at (0, 0) in the direction making an

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What is the rate of change of ƒ(x, y) at (0, 0) in the direction making an angle of 45° with the x-axis if ∇ƒ(0, 0) = (2, 4)?

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Calculus

ISBN: 9781319055844

4th Edition

Authors: Jon Rogawski, Colin Adams, Robert Franzosa

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