A function f(x, y) = x3 − 3xy2 + y3 is homogeneous of degree n when                f (tx, ty) = tnf (x, y). (a) show that the function is homogeneous and determine n, and      (b) show that xfx(x, y) + yfy(x, y) = nf (x, y).

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter9: Multivariable Calculus
Section9.2: Partial Derivatives
Problem 25E
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A function f(x, y) = x3 − 3xy2 + y3 is homogeneous of degree n when                f (tx, ty) = tnf (x, y). (a) show that the function is homogeneous and determine n, and      (b) show that xfx(x, y) + yfy(x, y) = nf (x, y).

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