Fill in the blank/s using the word sum, difference, product, or quotient : The formula cos * + cos * = 2 cos (* + *)/2 cos (* - *)/2 can be used to change a __________ of two cosines into the _________ of two cosine expressions.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.1: Verifying Trigonometric Identities
Problem 69E
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Fill in the blank/s using the word sum, difference, product, or quotient : The formula cos * + cos * = 2 cos (* + *)/2 cos (* - *)/2 can be used to change a __________ of two cosines into the _________ of two cosine expressions.

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