Answer
$b^2+c^2-2bc \cos{A}$
Work Step by Step
The law of cosines states that:
$$a^2 = b^2+c^2-2bc \cos{A}$$
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 7 - Section 7.2 - The Law of Cosines - 7.2 Problem Set - Page 378: 9
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