Answer
Complement
Work Step by Step
Cofunction theorem states that a "trigonometric function of an angle is always equal to the cofunction of the complement of the angle".
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 2 - Section 2.1 - Definition II: Right Triangle Trigonometry - 2.1 Problem Set - Page 61: 3
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