Answer
$\dfrac{7}{25}$
Work Step by Step
$\cos{2A} = 1-2\sin^2 {A} = 1-2\left(\dfrac{-3}{5}\right)^2 = \dfrac{7}{25}$
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: 8
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