Answer
$\cos{(-5.2825)} \approx 0.5397$
Work Step by Step
Use a calculator in radian mode and round-off the answer to four decimal places to obtain:
$\cos{(-5.2825)} \approx 0.5397$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 6 - The Circular Functions and Their Graphs - 6.2 The Unit Circle and Circular Functions - 6.2 Exercises - Page 588: 38
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