Trigonometry Question
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 20E
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Transcribed Image Text:Express the given product as a sum or difference containing only sines or cosines.
sin (9x) sin (3x)
sin (9x) sin (3x) =|
(Simplify your answer.)
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