Express the given sum or difference as a product of sines and/or cosines. cos x+ cos 3x cos x+ cos 3x = (Simplify your answer.)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 16E
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Express the given sum or difference as a product of sines and/or cosines.
cos x+ cos 3x
cos x+ cos 3x =
(Simplify your answer.)
Transcribed Image Text:Express the given sum or difference as a product of sines and/or cosines. cos x+ cos 3x cos x+ cos 3x = (Simplify your answer.)
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