Answer
fill the blank with
... $\pi$ ...
Work Step by Step
For inverse functions,
$f(f^{-1}(y))=y$ and
$f^{-1}(f(x))=x.$
so,
$f^{-1}(-1)=f^{-1}(f(\pi))=\pi.$
fill the blank with
... $\pi$ ...
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 7 - Trigonometric Identities and Equations - 7.5 Inverse Circular Functions - 7.5 Exercises - Page 707: 5
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