#### Answer

cosine function $(y=\cos{x})$

#### Work Step by Step

The curve is sinusoidal and has a period of $2\pi$.
Since the value of the function when $x=0$ is $1$, then the graph must that of the cosine function.

Published by
Pearson

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

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

cosine function $(y=\cos{x})$

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