Answer
See below.
Work Step by Step
$LHS=\frac{1}{1-sin\theta}+\frac{1}{1+sin\theta}=\frac{1+sin\theta+1-sin\theta}{1-sin^2\theta}=\frac{2}{cos^2\theta}=2sec^2\theta=RHS$
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 6 - Analytic Trigonometry - Section 6.4 Trigonometric Identities - 6.4 Assess Your Understanding - Page 497: 75
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