Answer
$\frac{sin~\theta}{cos~(-\theta)}=tan~\theta$
Work Step by Step
$cos~x$ is an even function, that is, $cos(-x)=cos~x$
$\frac{sin~\theta}{cos~(-\theta)}=\frac{sin~\theta}{cos~\theta}=tan~\theta$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 7 - 7.1 - Using Fundamental Identities - 7.1 Exercises - Page 514: 71
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