?For the following exercises, prove the identities provided.\(cos(x + y)cos(x ? y) =
Chapter 9, Problem 50(choose chapter or problem)
For the following exercises, prove the identities provided.
\(cos(x + y)cos(x − y) = cos^{2} x − sin^{2} y\)
Text Transcription:
cos(x + y)cos(x − y) = cos^2 x − sin^2 y
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