Prove: cos 30 = 4 cos³ 0 - 3 cos 0

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 28E
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Prove: cos 30 = 4 cos³ 0 - 3 cos
Transcribed Image Text:Prove: cos 30 = 4 cos³ 0 - 3 cos
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