In Exercise (a) find the directional derivative of f at P in the direction from P to Q; (b) find a unit vector in the direction in which f increases most rapidly at P and find the rate of change of f in that direction. (c) find a unit vector in the direction in which f decreases most rapidly at P and find the rate of change of f in that direction. f(x, y) = sin (2x - y); P(-1/3, 1/6), Q(0, 0)

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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In Exercise
(a) find the directional derivative of f at P in the direction
from P to Q;
(b) find a unit vector in the direction in which f increases
most rapidly at P and find the rate of change of f
in that direction.
(c) find a unit vector in the direction in which f decreases
most rapidly at P and find the rate of change of f
in that direction.
f(x, y) = sin (2x – y); P(-1/3, 1/6), Q(0, 0)
f(x, y, z) = x/y – y/z; P(0, – 1, 2), Q(3, 1, – 4)
-
Transcribed Image Text:In Exercise (a) find the directional derivative of f at P in the direction from P to Q; (b) find a unit vector in the direction in which f increases most rapidly at P and find the rate of change of f in that direction. (c) find a unit vector in the direction in which f decreases most rapidly at P and find the rate of change of f in that direction. f(x, y) = sin (2x – y); P(-1/3, 1/6), Q(0, 0) f(x, y, z) = x/y – y/z; P(0, – 1, 2), Q(3, 1, – 4) -
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