Elementary Technical Mathematics

by Nelson, Robert; Eren, Dale;

Published by Brooks Cole

ISBN 10: 1285199197

ISBN 13: 978-1-28519-919-1

Chapter 14 - Section 14.1 - Sine and Cosine Graphs - Exercise - Page 480: 7

Answer

-0.9724

Work Step by Step

Rounded to four significant digits, we have (using a calculator): $$ \cos 166.5^o=-0.97236=-0.9724 .$$

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