Prove each identity.   cos (A 1 +) + cos (A - B) = 2 cos A cos B

Trigonometry (MindTap Course List)
8th Edition
ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter6: Equations
Section6.3: Trigonometric Equations Involving Multiple Angles
Problem 77PS
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Prove each identity.

 

cos (A 1 +) + cos (A - B) = 2 cos A cos B

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