Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 4 - Section 4.5 - Graphs of Sine and Cosine Functions - Exercise Set - Page 596: 42


Please see below.

Work Step by Step

Please note that a cosine function $y=A\cos Bx$ has amplitude $|A|$ and period $\frac{2\pi }{B}$. So the function $y=-\frac{1}{2}\cos \frac{\pi }{4} x$ has amplitude $|-\frac{1}{2}|=\frac{1}{2}$ and period $\frac{2\pi }{\frac{\pi }{4} }=8$.
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