Simplify 3k(cos2 theta + cos theta)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.2: Trigonometric Functions Of Angles
Problem 43E
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Simplify 3k(cos2 theta + cos theta)

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