Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 6 - Trigonometric Functions - 6.4 Graphs of the Sine and Cosine Functions - 6.4 Assess Your Understanding - Page 408: 29

Answer

(C).

Work Step by Step

Given $y=-2cos(\frac{1}{2}x)$, we can identify its amplitude as $|A|=2$, period as $p=\frac{2\pi}{1/2}=4\pi$, and pass point $(0,-2)$. Thus the answer is (C).
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