What is the exact value of Cos- 4 ?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 19E
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What is the exact value of Cos-
4 ?
Transcribed Image Text:5 T What is the exact value of Cos- 4 ?
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