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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Calculus Early Transcendentals

ISBN: 9781337613927

9th Edition

Authors: James Stewart, Daniel K. Clegg, Saleem Watson, Lothar Redlin

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