7) Use sun and difference formula to verify the identity cos(A+B) cos(A-B) = cos2A + cos2B-1 A-B) = cos² A

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 28E
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7) Use sun and difference formula to verify the identity
cos(A + B) cos(AB) = cos2A + cos2B-1
Transcribed Image Text:7) Use sun and difference formula to verify the identity cos(A + B) cos(AB) = cos2A + cos2B-1
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