Answer
False.
Work Step by Step
False, because we must subtract twice the product of the two sides times the cosine of the angle opposite to the side we want to find.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 8 - Applications of Trigonometric Functions - 8.3 The Law of Cosines - 8.3 Assess Your Understanding - Page 537: 7
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