Answer
Not needed.
Work Step by Step
The trigonometric substitution is not needed and instead, we can use the substitution $ u=9−x^2$.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 8 - Techniques of Integration - 8.3 Trigonometric Substitution - Preliminary Questions - Page 409: 2
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