DETAILS Use an Addition or Subtraction Formula to find the exact value of the expressior cos(165°)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 15E
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Use an Addition or Subtraction Formula to find the exact value of the expression.
cos(165°)
Transcribed Image Text:DETAILS Use an Addition or Subtraction Formula to find the exact value of the expression. cos(165°)
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