Use the formula in Exercise 89 to prove the addition formula for cosine. cos( ) =
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Use the formula in Exercise 89 to prove the addition formula for cosine.
cos(α – β) = cos α cos β + sin α sin β
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Related Book For
Calculus Early Transcendentals
ISBN: 9781337613927
9th Edition
Authors: James Stewart, Daniel K. Clegg, Saleem Watson, Lothar Redlin
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