Precalculus (6th Edition) Blitzer

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

Chapter 4 - Section 4.4 - Trigonometric Functions of Any Angle - Exercise Set - Page 576: 118

Answer

$0$ $4$ $0$ $-4$ $0$

Work Step by Step

Step 1. Given the function $y=f(x)=4sin(2x-\frac{2\pi}{3})$, we have $f(\frac{\pi}{3})=4sin(2(\frac{\pi}{3})-\frac{2\pi}{3})=4sin(0)=0$ Step 2. Similarly, we have $f(\frac{7\pi}{12})=4sin(2(\frac{7\pi}{12})-\frac{2\pi}{3})=4sin(\frac{\pi}{2})=4$ Step 3. We have $f(\frac{5\pi}{6})=4sin(2(\frac{5\pi}{6})-\frac{2\pi}{3})=4sin(\pi)=0$ Step 4. We have $f(\frac{13\pi}{12})=4sin(2(\frac{13\pi}{12})-\frac{2\pi}{3})=4sin(\frac{3\pi}{2})=-4$ Step 5. Finally, we have $f(\frac{4\pi}{3})=4sin(2(\frac{4\pi}{3})-\frac{2\pi}{3})=4sin(2\pi)=0$
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