Trigonometric Form 1-cos 20 1+ Cos 20 11

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.2: Trigonometric Functions Of Angles
Problem 8E
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Trigonometric Formula I am not understanding the process of the formula 

Trigonometric Form
1-Cos 20
1+ Cos 20
11
Transcribed Image Text:Trigonometric Form 1-Cos 20 1+ Cos 20 11
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