Let g(x, y, z) = sin(xyz). (a) Compute the gradient Vg(1, 0, π/2). (b) Compute the directional derivative Dug(1, 0, π/2) where u = (1/√2,0, 1/√2). (c) Find all the directions u for which the directional derivative Dug(1, 0, π/2) is zero.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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2. Let g(x, y, z) = sin(xyz).
(a) Compute the gradient Vg(1, 0, π/2).
(b) Compute the directional derivative Dug(1, 0, π/2) where u = (1/√2,0, 1/√2).
(c) Find all the directions u for which the directional derivative Dug(π, 0, π/2) is zero.
(d) What are the directions u for which the above directional derivative reaches its maximum? and
minimum?
Transcribed Image Text:2. Let g(x, y, z) = sin(xyz). (a) Compute the gradient Vg(1, 0, π/2). (b) Compute the directional derivative Dug(1, 0, π/2) where u = (1/√2,0, 1/√2). (c) Find all the directions u for which the directional derivative Dug(π, 0, π/2) is zero. (d) What are the directions u for which the above directional derivative reaches its maximum? and minimum?
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