Single Variable Calculus Format: Unbound (saleable)
Single Variable Calculus Format: Unbound (saleable)
3rd Edition
ISBN: 9780134765761
Author: Briggs, William L.^cochran, Lyle^gillett, Bernard^
Publisher: Prentice Hall
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Chapter C, Problem 29E
To determine

To prove: The trigonometric identities cos(ab)=cosacosb+sinasinb and sin(ab)=sinacosbcosasinb.

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