Answer
$1$
Work Step by Step
Using a calculator in degree mode:
$cos0^{\circ}=1$
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 11 - Section 11.2 - The Cosine Ratio and Applications - Exercises - Page 509: 10
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