Answer
See the steps.
Work Step by Step
$\sin{(90+\theta)} = \sin{90} \cos{\theta} + \cos{90} \sin{\theta}$
$\sin{(90+\theta)} = 1 \times \cos{\theta} + 0 \times \sin{\theta} = \cos{\theta}$
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 5.2 - Sum and Difference Formulas - 5.2 Problem Set - Page 288: 23
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