Answer
The identity tan α = $\frac{sin α}{cos α}$ is valid
Work Step by Step
tan α = $\frac{a}{b}$
$\frac{sin α}{cos α}$= $\frac{\frac{a}{c}}{\frac{b}{c}}$= $\frac{a}{b}$
Elementary Geometry for College Students (6th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
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: 33a
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