Prove the identity. 9 sin(x – y) cos(x) cos(y) 9 tan(x) – 9 tan(y) %3D Use a Reciprocal Identity, and then rewrite as a single rational expression. 9 sin(y) cos(y) 9 tan(x) - 9 tan(y) %3D cos(x) cos(x) cos(y) Use an Addition or Subtraction Formula to simplify. %3D

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 62E
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Prove the identity.
9 tan(x) – 9 tan(y) =
9 sin(x – y)
cos(x) cos(y)
Use a Reciprocal Identity, and then rewrite as a single rational expression.
9 sin(y)
cos(y)
9 tan(x) - 9 tan(y)
-
%3D
cos(x)
%3D
cos(x) cos(y)
Use an Addition or Subtraction Formula to simplify.
Transcribed Image Text:Prove the identity. 9 tan(x) – 9 tan(y) = 9 sin(x – y) cos(x) cos(y) Use a Reciprocal Identity, and then rewrite as a single rational expression. 9 sin(y) cos(y) 9 tan(x) - 9 tan(y) - %3D cos(x) %3D cos(x) cos(y) Use an Addition or Subtraction Formula to simplify.
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