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Mathematics 10 Online
OpenStudy (anonymous):

Use the sum or difference identity to write the expression as the sine, cosine, or tangent of an angle. Cos(5x)cos(x)-sin(5x)sin(x)

OpenStudy (anonymous):

hello :3 go to this page. in the middle you'll find something related to your question and i hope it helps :3 http://oakroadsystems.com/twt/sumdiff.htm

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