Use Theorem Directional Derivative to find the directional derivative of the function f(x, y) = x2 + y2, at P (1, −2),   = /4 in the direction of the unit vector u = cos i + sin j.

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter4: Calculating The Derivative
Section4.4: Derivatives Of Exponential Functions
Problem 37E: Use graphical differentiation to verify that ddxex=ex.
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Use Theorem Directional Derivative to find the directional derivative of the function f(x, y) = x2 + y2, at P (1, −2),   = /4 in the direction of the unit vector u = cos i + sin j.

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ISBN:
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