Precalculus (6th Edition) Blitzer

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

Chapter 5 - Section 5.2 - Sum and Difference Formulas - Exercise Set - Page 670: 68


a. $y= 2sin(x)$ b. See graph.

Work Step by Step

a. Using the Sum Formula, we have $y=cos(x)cos(\pi/2)+sin(x)sin(\pi/2)-cos(x)cos(\pi/2)+sin(x)sin(\pi/2)=2sin(x)$ b. We can graph the new function $y=2sin(x)$ and compare with the given graph to see that they are identical.
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