1 + cos(20) + cos(40) + cos(60) 4 cos 0 cos(20) cos(30)
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 28E
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Establish each identity.
![1 + cos(20) + cos(40) + cos(60)
4 cos 0 cos(20) cos(30)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fea5daffd-550b-4359-83ca-bca1bdc9a241%2F762e2a88-b670-4fde-981b-bafe2df34886%2Fpg8t6v_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1 + cos(20) + cos(40) + cos(60)
4 cos 0 cos(20) cos(30)
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