Answer
$A$
Work Step by Step
Both the sine and cosine functions are defined for any real number $x$.
Thus, the domain of both the sine and cosine functions is:
$(-\infty, +\infty)$.
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 3 - Review Exercises - Page 136: 44a
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