Answer
a) $-\frac{1}{4}$
b) $-\frac{1}{4}$
Work Step by Step
The exercise is asking you to evaluate the partial derivatives and apply in that point, which is done on the image below.
Calculus, 10th Edition (Anton)
by Anton, Howard
Published by
Wiley
ISBN 10:
0-47064-772-8
ISBN 13:
978-0-47064-772-1
Chapter 13 - Partial Derivatives - 13.3 Partial Derivatives - Exercises Set 13.3 - Page 936: 14
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