Answer
a) For all (x,y,z) such that $xyz \gt 0$
b) For all (x,y,z)
Work Step by Step
a) $\ln x$ should be computed for positive values only.
b) We can take the $cos$ of any value.
University Calculus: Early Transcendentals (3rd Edition)
by Hass, Joel R.; Weir, Maurice D.; Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0321999584
ISBN 13:
978-0-32199-958-0
Chapter 13 - Section 13.2 - Limits and Continuity in Higher Dimensions - Exercises - Page 691: 36
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