38. Simplify: cos 40° cos 110° - sin 40° sin 110⁰ 39. Simplify: cos 50° cos 20° + sin 50° sin 20⁰

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.2: Trigonometric Functions Of Angles
Problem 39E
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38. Simplify:
cos 40° cos 110° - sin 40° sin 110⁰
39. Simplify:
cos 50° cos 20° + sin 50° sin 20⁰
Transcribed Image Text:38. Simplify: cos 40° cos 110° - sin 40° sin 110⁰ 39. Simplify: cos 50° cos 20° + sin 50° sin 20⁰
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