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 (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 3 - Review Exercises - Page 130: 42a
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