cos 2r + cos 2y cot (y - x) cot (y + x) (y + x) Cos 2r cos 2y 1
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.4: Values Of The Trigonometric Functions
Problem 38E
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Verify number 55 using the identities provided
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