At the point (1, 2), the function (x, y) has a derivative of 2 in the direction

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At the point (1, 2), the function ƒ(x, y) has a derivative of 2 in the direction toward (2, 2) and a derivative of -2 in the direction toward (1, 1).

a. Find ƒx(1, 2) and ƒy(1, 2).

b. Find the derivative of ƒ at (1, 2) in the direction toward the point (4, 6).

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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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