Answer
$\cos{x}$
Work Step by Step
$\cos{(A-B)} = \cos{A} \cos{B} + \sin{A} \sin{B}$
$\therefore \cos{3x} \cos{2x} + \sin{3x} \sin{2x} = \cos{(3x-2x)} = \cos{x}$
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 289: 30
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