Answer
$\sec{21^o}\approx 1.07$
Work Step by Step
RECALL:
$\sec{x} = \dfrac{1}{\cos{x}}$
Use a scientific calculator in degree mode.
Round-off answer to two decimal places to obtain:
$\sec{21^o} =\dfrac{1}{\cos{21^o}} \approx 1.07$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 5 - Trigonometric Functions - Section 5.2 Trigonometric Functions: Unit Circle Approach - 5.2 Assess Your Understanding - Page 403: 67
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