Answer
$0.5((\cos(2x)-\cos(10x))$
Work Step by Step
We know that $\sin A\sin B=0.5((\cos(A-B)-\cos(A+B))$, thus $\sin 6x\sin 4x=0.5((\cos(2x)-\cos(10x))$
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 - Test - Page 316: 29
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