(b) Use De Moivre's theorem to find an expression for cos40 in terms of sin e only.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section: Chapter Questions
Problem 72RE
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(b)
Use De Moivre's theorem to find an expression for cos 40 in terms of sin e only.
Transcribed Image Text:(b) Use De Moivre's theorem to find an expression for cos 40 in terms of sin e only.
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