Answer
$-$ (minus sign)
Work Step by Step
The formula for the cosine of the sum of two angles $A$ and $B$ is:
$\cos(A+B)=\cos A \cos B-\sin A \sin B$
Hence, the answer is "$\color{blue}{-}$" (minus sign)
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 7 - Analytic Trigonometry - 7.5 Sum and Difference Formulas - 7.5 Assess Your Understanding - Page 487: 5
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