Answer
$f$
Work Step by Step
when we look at the graph of 3D surface in $f$, it can be seen see that in the graph , there are two humps .
This means that the graph of 2D level curves shows two big circular rings.
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 14.1 - Functions of Several Variables - Exercises 14.1 - Page 787: 31
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