Prove the identity. sin(x) + sin(7x) cos(x) + cos(7x) Use the Sum-to-Product Formulas and then simplify. sin(x) + sin(7x) cos(x) + cos(7x) =tan(4x) = 2 cos(4x) cos(3x) cos(4x)
Prove the identity. sin(x) + sin(7x) cos(x) + cos(7x) Use the Sum-to-Product Formulas and then simplify. sin(x) + sin(7x) cos(x) + cos(7x) =tan(4x) = 2 cos(4x) cos(3x) cos(4x)
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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Transcribed Image Text:Prove the identity.
sin(x) + sin(7x)
= tan(4x)
cos(x) + cos(7x)
Use the Sum-to-Product Formulas and then simplify.
sin(x) + sin(7x) =
cos(x) + cos(7x)
2 cos(4x) cos(3x)
cos(4x)
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