Find the exact value of cos 225. State restrictions on the following f(x): X x²-9

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section: Chapter Questions
Problem 49RE
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16. Find the exact value of cos 225.
17. State restrictions on the following f(x) =
X
x²-9
Transcribed Image Text:16. Find the exact value of cos 225. 17. State restrictions on the following f(x) = X x²-9
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