Answer
See explanations.
Work Step by Step
Divide the left side numerator and denominator by $cos\theta$ and use the relation $sec\theta=\frac{1}{cos\theta}$. We have $LHS=\frac{1+1/cos\theta}{1-1/cos\theta}=\frac{1+sec\theta}{1-sec\theta}=RHS$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 7 - Analytic Trigonometry - 7.4 Trigonometric Identities - 7.4 Assess Your Understanding - Page 476: 50
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