Let F(x, y) = [2ry² +x, 2r²y + y]. Find all functions f with gradient F. Find the derivative of f in the direction of [2, 1] at the point (3,3). At the point (3,3) in which direction is the directional derivative of f maximal? What is the value of the direc- tional derivative of f in this direction at (3,3)? Find the equation of the tangent plane to z = In(2r + y) at (-1,3).

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Let F(x, y) = [2ry² + x, 2a²y + y].
1. Find all functions f with gradient F.
2. Find the derivative of f in the direction of [2, 1] at the point (3, 3).
3. At the point (3, 3) in which direction is the directional derivative of f maximal? What is the value of the direc-
tional derivative of ƒ in this direction at (3,3)?
4. Find the equation of the tangent plane to z = In(2r + y) at (-1,3).
Transcribed Image Text:Let F(x, y) = [2ry² + x, 2a²y + y]. 1. Find all functions f with gradient F. 2. Find the derivative of f in the direction of [2, 1] at the point (3, 3). 3. At the point (3, 3) in which direction is the directional derivative of f maximal? What is the value of the direc- tional derivative of ƒ in this direction at (3,3)? 4. Find the equation of the tangent plane to z = In(2r + y) at (-1,3).
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