Answer
When $P \lt 0$, the eardrum would be vibrating outward.
Work Step by Step
When P is negative, there is a decrease in pressure and the eardrum is pushed outward. Therefore, when $P \lt 0$, the eardrum would be vibrating outward.
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 6 - Inverse Circular Functions and Trigonometric Equations - Section 6.2 Trigonometric Equations I - 6.2 Exercises - Page 268: 61c
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