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Level 4

Angle Sum & Difference identities


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sin(α+β)
sinα cosβ + cosα sinβ
cos(α+β)
cosα cosβ - sinα sinβ
tan(α+β)
(tanα + tanβ) / (1 - tanα tanβ)
sin(α-β)
sinα cosβ - cosα sinβ
cos(α-β)
cosα cosβ + sinα sinβ
tan(α-β)
(tanα - tanβ) / (1 + tanα tanβ)