Answer
$\cos(A)\cos(B)+\sin(A)\sin(B)$
Work Step by Step
By definition, we have
$\cos{(A-B)}=\cos(A)\cos(B)+\sin(A)\sin(B)$.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 9 - Polar Coordinates; Vectors - 9.2 Polar Equations and Graphs - 9.2 Assess Your Understanding - Page 585: 2
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