Answer
$ -1.356342$
Work Step by Step
$\sec 222^{\circ}30'= \sec 222.5^{\circ}=\frac{1}{\cos 222.5^{\circ}}$
Using a calculator in degree mode, we can find
$\frac{1}{\cos 222.5^{\circ}}\approx -1.356342$
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 5 - Trigonometric Functions - Chapter 5 Test Prep - Review Exercises - Page 560: 43
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