Answer
a)
Work Step by Step
a), because this means multiplying both sides by $(\cos x)(1+\sin x)$ which is a valid step and will allow us to use the identity $\sin^2 x+\cos^2 x=1$.
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 5 - Section 5.1 - Proving Identities - 5.1 Problem Set - Page 281: 95
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