| No | Rumus |
| 1 |
\(\sin (A + B) = \sin A \cos B + \cos A \sin B \) \(\sin (A - B) = \sin A \cos B - \cos A \sin B \) |
| 2 |
\(\cos (A + B) = \cos A \cos B - \sin A \sin B \) \(\cos (A - B) = \cos A \cos B + \sin A \sin B \) |
| 3 |
\(\tan (A + B) = \dfrac{\tan A + \tan B}{1 - \tan A \tan B} \)
\(\tan (A - B) = \dfrac{\tan A - \tan B}{1 + \tan A \tan B} \) |