Write the expression as a single trigonometric function. cos(9x)cos(8x)-sin(9x)sin(8x)

Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter7: Analytic Trigonometry
Section7.CT: Chapter Test
Problem 22CT
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Write the expression as a single trigonometric function.

cos(9x)cos(8x)-sin(9x)sin(8x)

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