Trigonometry 7th Edition

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: 25


$80^{\circ}$ $ \sin 10^{\circ} = \cos 80^{\circ}$

Work Step by Step

$ \sin 10^{\circ} = \cos 80^{\circ}$ Reason- sine and cosine are cofunctions and $ 10^{\circ} + 80^{\circ} = 90^{\circ}$
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