sin(4θ) cos(5θ) product as a sum or differnce containing only sines or cosines

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.1: Angles
Problem 17E
Question

sin(4θ) cos(5θ) product as a sum or differnce containing only sines or cosines

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