Answer
$(-\infty, \infty)$
Work Step by Step
The graph of the cosine function shows that the domain of the cosine function consists of all real numbers. This means that the domain of the cosine function can be written as $(-\infty, \infty)$.
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 4 - Test - Page 193: 3a
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