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Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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### Problem 4

Use \( f(x, y) = \sin x \cos y \) for each of the following parts.

**(c)** Give a unit direction vector \( \mathbf{u} \) such that \( D_{\mathbf{u}} f = 0 \) at \( P \). State in words what this vector implies.
Transcribed Image Text:### Problem 4 Use \( f(x, y) = \sin x \cos y \) for each of the following parts. **(c)** Give a unit direction vector \( \mathbf{u} \) such that \( D_{\mathbf{u}} f = 0 \) at \( P \). State in words what this vector implies.
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