Answer
$C$.
Work Step by Step
Function $y=2cos(x)$ can be taken as the result of stretching $y=cos(x)$ vertically by a factor of $2$, thus the answer is $C$.
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 - 6.3 Graphs of the Sine and Cosine Functions - 6.3 Exercises - Page 601: 12
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