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Trigonometry

Sum and Difference Identities

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