Find the directional derivative of Du f(2,1) in the direction of: d = 7i + 2j To f(x, y) = In(Ges V12 sin(x – 2y) + 8y² – x³ – 6x²y + 32)

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter4: Eigenvalues And Eigenvectors
Section4.6: Applications And The Perron-frobenius Theorem
Problem 69EQ: Let x=x(t) be a twice-differentiable function and consider the second order differential equation...
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1.
Find the directional derivative of Du f(2,1) in the direction of:
d = 7ỉ + 2j \
To f(x, y) = InGes V12 sin(x – 2y) + 8y² – x³ – 6x²y + 32)
2.
Show that the following functions W = f{x, y) satisfy the equation Wxx + Wyy = 0
Called the two-dimensional Laplace equation:
W(x, y) = In(x 2 + y 2 )
3.
2е у- п 2sinx - Зе х- п 4соs(y), find:
a2z
a²z n n
dz
а)
əxây (75) .c);
6)
дудх
дхду
Transcribed Image Text:1. Find the directional derivative of Du f(2,1) in the direction of: d = 7ỉ + 2j \ To f(x, y) = InGes V12 sin(x – 2y) + 8y² – x³ – 6x²y + 32) 2. Show that the following functions W = f{x, y) satisfy the equation Wxx + Wyy = 0 Called the two-dimensional Laplace equation: W(x, y) = In(x 2 + y 2 ) 3. 2е у- п 2sinx - Зе х- п 4соs(y), find: a2z a²z n n dz а) əxây (75) .c); 6) дудх дхду
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