Answer
true, defined
Work Step by Step
Identities are statements or relations or equations which are true for all replacements of the variable for which they are 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 1 - Section 1.4 - Introduction to Identities - 1.4 Problem Set - Page 39: 1
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