Find the exact value of cos(83°) cos(23°) + sin(83°) sin(23°)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 28E
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. Find the exact value of cos(83°) cos(23°) + sin(83°) sin(23°)
5. Prove the identity cos(4x) - cos(3x) cos x = sin² x - 4cos² x sin² x
Transcribed Image Text:. Find the exact value of cos(83°) cos(23°) + sin(83°) sin(23°) 5. Prove the identity cos(4x) - cos(3x) cos x = sin² x - 4cos² x sin² x
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