Answer
Expression $A$
Work Step by Step
Use the Cosine of a Difference formula:
$\cos(x-y)=\cos x \cos y +\sin x \sin y$
The expression $2$ in Column I matches the expression $A$ in Column II.
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 5 - Trigonometric Identities - Section 5.3 Sum and Difference Identities for Cosine - 5.3 Exercises - Page 218: 2
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