Derive the following expressions by using vector algebra. (a) cos (a ) = cos a cos

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Derive the following expressions by using vector algebra.
(a) cos (a – β) = cos a cos β + sin a sin β
(b) sin (a – β) = sin a cos β – cos a sin β
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Calculus Early Transcendentals

ISBN: 978-0321947345

2nd edition

Authors: William L. Briggs, Lyle Cochran, Bernard Gillett

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