Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 11 - Section 11.3 - The Tangent Ratio and Other Ratios - Exercises - Page 512: 35a


The identity sec α = $\frac{1}{cos α}$ is valid

Work Step by Step

sec α = $\frac{c}{b}$ cos α = $\frac{b}{c}$ $\frac{1}{cos α}$ = $\frac{1}{\frac{b}{c}}$ = $\frac{c}{b}$ So sec α and $\frac{1}{cos α}$ are equivalent
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