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Trigonometry
Sum and Difference Identities
Question | Answer |
---|---|
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) |