Use de Moivre's formula to establish the identity cos 40 = 8 cos*0 – 8 cos²0 +1

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.5: Product-to-sum And Sum-to-product Formulas
Problem 31E
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Use de Moivre's formula to establish the identity
40 = 8 cos40 – 8 cos²0 + 1
Transcribed Image Text:Use de Moivre's formula to establish the identity 40 = 8 cos40 – 8 cos²0 + 1
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