Answer
equal, defined
Work Step by Step
An identity in trigonometry is an equality between two expressions for all replacements of the variable for which each expression is defined.
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 278: 1
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