Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 7 - Review Exercises - Page 553: 83

Answer

True. The identity is verified.

Work Step by Step

$4~sin(-x)~cos(-x)=4(-sin~x)~cos~x=-4~sinx~cos~x=-2(2~sinx~cos~x)=-2~sin~2x$
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