Answer
False
Work Step by Step
The period of both $\sin x$ and $\cos x$ is $2\pi$. So, it is not right to say $f(x)=\cos x$ is periodic with a period of $\pi$
Calculus with Applications (10th Edition)
by Lial, Margaret L.; Greenwell, Raymond N.; Ritchey, Nathan P.
Published by
Pearson
ISBN 10:
0321749006
ISBN 13:
978-0-32174-900-0
Chapter 13 - The Trigonometric Functions - Chapter Review - Review Exercises - Page 701: 1
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