Answer
$50^{\circ}$
$ \cos 40^{\circ} = \sin 50^{\circ}$
Work Step by Step
$ \cos 40^{\circ} = \sin 50^{\circ}$
Reason-
cosine and sine are cofunctions and
$ 40^{\circ} + 50^{\circ} = 90^{\circ}$
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 62: 26
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