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1. \(\sin(A \pm B) = \sin A \cos B \pm \cos A \sin B\)
2. \(\cos(A \pm B) = \cos A \cos B \mp \sin A \sin B\)
1. \(\tan(A \pm B) = \dfrac{\tan A \pm \tan B}{1 \mp \tan A \tan B}\)
2. \(\cot(A \pm B) = \dfrac{\cot A \cot B \mp 1}{\cot B \pm \cot A}\)

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