Answer
$$cos(2x)$$
Work Step by Step
We know that $f(x)$ is the function that is plugged into the original equation for x. Thus, it follows that $f(x)$ is:
$$cos(2x)$$
Functions Modeling Change: A Preparation for Calculus, 5th Edition
by Connally, Eric; Hughes-Hallett, Deborah; Gleason, Andrew M.; Cheifetz, Phil C.
Published by
Wiley
ISBN 10:
1118583191
ISBN 13:
978-1-11858-319-7
Chapter 10 - Compositions, Inverses, and Combinations of Functions - 10.1 Composition of Functions - Exercises and Problems for Section 10.1 - Exercises and Problems - Page 401: 20
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