Find the exact value of s in [0,π) and cos s=-1/2

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 45E
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Find the exact value of s in [0,π) and cos s=-1/2

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