cos(nt/2)
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.2: Trigonometric Equations
Problem 50E
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Supposedly, this is a true statement, but I don't know why. Is there some indentity about cos of half angles and inequalities?
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