Verify that the equation is an identity. cos (x+y)+ cos (x-y) = 2 cos x cos y cos (x +y)+ cos (x - y) = 0 +O (Type the terms of your expression in the same order as they appear in the ori (Do not combine like terms.) = 2 cos x cos y Use the even-odd identities. Use the Pythagorean identities. Use the quotient identities. Use the sum and difference identities.
Verify that the equation is an identity. cos (x+y)+ cos (x-y) = 2 cos x cos y cos (x +y)+ cos (x - y) = 0 +O (Type the terms of your expression in the same order as they appear in the ori (Do not combine like terms.) = 2 cos x cos y Use the even-odd identities. Use the Pythagorean identities. Use the quotient identities. Use the sum and difference identities.
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:Verify that the equation is an identity.
cos (x + y) + cos (x- y)= 2 cos x cos y
cos (x+y)+ cos (x-y)
O+O
(Type the terms of your expression in the same order as they appear in the ori
(Do not combine like terms.)
= 2 cos x cos y
Use the even-odd identities.
Use the Pythagorean identities.
Use the quotient identities.
Use the sum and difference identities.
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