16. What is the exact value of cos (−15°)?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 59E
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16. What is the exact value of cos (−15°)?
O √2+√6
4
O
-√6-√2
4
дл-ъл о
о
4
√6-√2
4
Transcribed Image Text:16. What is the exact value of cos (−15°)? O √2+√6 4 O -√6-√2 4 дл-ъл о о 4 √6-√2 4
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