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