Prove the following identities. 4. cos3a = 4 cos' a – 3cosa
Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE:
1. Give the measures of the complement and the supplement of an angle measuring 35°.
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show the complete solution. thank you :)
Transcribed Image Text:Prove the following identities.
4. cos3a = 4 cos' a – 3 cosa
а —
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