#### 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 $(-\infty, \infty)$.

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Published by
Pearson

ISBN 10:
978-0-13-421743-7

ISBN 13:
978-0-13421-743-7

$(-\infty, \infty)$

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