Answer
$y=cos(2x)$
Work Step by Step
From the given graph, we can identify: amplitude $1$, period $\pi$, thus the function can be $y=cos(2x)$
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 6 - The Circular Functions and Their Graphs - Quiz - Page 616: 15
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