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PreCalculus 2006

5.1/5.3 Sum and Difference Formulas for Cos, Sin, and Tan

QuestionAnswer
cos(α + β) = cosα cosβ - sinα sinβ
cos(α - β) = cosα cosβ + sinα sinβ
sin(α + β) = sinα cosβ + cosα sinβ
sin(α - β) = sinα cosβ - cosα sinβ
tan(α + β) = tanα + tanβ / 1- tanα tanβ
tan(α - β) tanα - tanβ / 1+ tanα tanβ
Created by: strider87
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