Simplify the following expression by using appropriate identities. Do not use a calculator. cos (8) cos (9)- sin (8) sin (9) cos (8) cos (9)- sin (8) sin (9) = (Type an exact answer in simplified form.) %3D

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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de
Simplify the following expression by using appropriate identities. Do not use a calculator.
kt
cos (23°) cos (69°) + sin (23°) sin (69°)
Select the correct choice below and fill in the answel box within your choice.
(Simplify your answer.)
ar
O A.
Cos
S
O B. sin
Transcribed Image Text:de Simplify the following expression by using appropriate identities. Do not use a calculator. kt cos (23°) cos (69°) + sin (23°) sin (69°) Select the correct choice below and fill in the answel box within your choice. (Simplify your answer.) ar O A. Cos S O B. sin
Simplify the following expression by using appropriate identities. Do not use a calculator.
cos (8) cos (9)- sin (8) sin (9)
cos (8) cos (9)- sin (8) sin (9) =|
(Type an exact answer in simplified form.)
%3D
Transcribed Image Text:Simplify the following expression by using appropriate identities. Do not use a calculator. cos (8) cos (9)- sin (8) sin (9) cos (8) cos (9)- sin (8) sin (9) =| (Type an exact answer in simplified form.) %3D
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