Answer
$\sqrt 2$
Work Step by Step
$sec45^{0}=\dfrac {1}{\cos 45^{0}}=\dfrac {1}{\dfrac {\sqrt {2}}{2}}=\dfrac {2}{\sqrt {2}}=\sqrt {2}$
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 - 5.3 Trigonometric Functions Values and Angle Measures - 5.3 Exercises - Page 532: 38
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