Simplify the expression algebraically. ​   ​sin(9x-9y)sin(9x-9y)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 26E
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Simplify the expression algebraically.

 

​sin(9x-9y)sin(9x-9y)

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