Answer
a) for all (x,y,z)such that $xyz \gt 0$ b) For all (x,y,z)
Work Step by Step
a) $\ln x$ must be computed for positive values only.
b) We can have any value of $\cos$.
Thomas' Calculus 13th Edition
by Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0-32187-896-5
ISBN 13:
978-0-32187-896-0
Chapter 14: Partial Derivatives - Section 14.2 - Limits and Continuity in Higher Dimensions - Exercises 14.2 - Page 796: 36
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