Multivariable Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 0-53849-787-4
ISBN 13: 978-0-53849-787-9

Chapter 14 - Partial Derivatives - 14.1 Exercises - Page 916: 72

Answer

Two local maximum points and two local minimum points.

Work Step by Step

We see two hilltops, both at the same value of z, about 0.18, and two "troughs" at about $z=-0.18.$
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