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Question	Answer
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

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