Answer
$\dfrac{119}{169}$
Work Step by Step
$\cos{\theta} = \dfrac{12}{13}$
$\cos{2\theta} =2 \cos^2{\theta} -1 = 2\left(\dfrac{12}{13}\right)^2 -1 $
$\cos{2\theta} = \dfrac{119}{169}$
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 5.3 - Double-Angle Formulas - 5.3 Problem Set - Page 296: 16
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