Suppose f(x, y) = √tan(x) + y and u is the unit vector in the direction of (1, 1). Then, (a) ▼ ƒ (x, y) = (b) ▼ƒ(-0.8, 10) = (c) fu (−0.8, 10) = Du f(−0.8, 10) =

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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Suppose \( f(x, y) = \sqrt{\tan(x)} + y \) and \( \mathbf{u} \) is the unit vector in the direction of \(\langle 1, 1 \rangle\). Then,

(a) \( \nabla f(x, y) = \) [ ]

(b) \( \nabla f(-0.8, 10) = \) [ ]

(c) \( f_{\mathbf{u}}(-0.8, 10) = D_{\mathbf{u}} f(-0.8, 10) = \) [ ]
Transcribed Image Text:Suppose \( f(x, y) = \sqrt{\tan(x)} + y \) and \( \mathbf{u} \) is the unit vector in the direction of \(\langle 1, 1 \rangle\). Then, (a) \( \nabla f(x, y) = \) [ ] (b) \( \nabla f(-0.8, 10) = \) [ ] (c) \( f_{\mathbf{u}}(-0.8, 10) = D_{\mathbf{u}} f(-0.8, 10) = \) [ ]
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