#### Answer

Not needed.

#### Work Step by Step

The trigonometric substitution is not needed and instead, we can use the substitution $ u=9−x^2$.

Chegg costs money, GradeSaver solutions are free!

Published by
W. H. Freeman

ISBN 10:
1464125260

ISBN 13:
978-1-46412-526-3

Not needed.

The trigonometric substitution is not needed and instead, we can use the substitution $ u=9−x^2$.

You can help us out by revising, improving and updating this answer.

Update this answerAfter you claim an answer you’ll have **24 hours** to send in a draft. An editor
will review the submission and either publish your submission or provide feedback.