Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 7 - Trigonometric Identities and Equations - 7.5 Inverse Circular Functions - 7.5 Exercises - Page 709: 68



Work Step by Step

Make sure that the setting for angles is "radians". $\sec^{-1}x$ is evaluated as $\displaystyle \cos^{-1}(\frac{1}{x}).$ Keys: "shift" or "2nd function" "cos" numerical keypad: (4.7963825) "=" yields $1.36076507875$
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