Using De Moivre's formula demonstrate that sin(3x) = 3sinx − 4sin3x

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 30E
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Using De Moivre's formula demonstrate that sin(3x) = 3sinx − 4sin3x

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