Answer
$c$
Work Step by Step
$\cos{(270-x)} = \cos{(270)} \cos{x} + \sin{(270)} \sin{x} $
$\cos{(270-x)} = 0 \times \cos{x} + \sin{270} \sin{x} = - \sin{x}$
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 291: 81
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