| No | Rumus |
| 1 |
\(\sin 2x = 2 \sin x \cos x \) |
| 2 |
\(\cos 2x = \cos^2 x - \sin^2 x \) \(\cos 2x = 2\cos^2 x - 1 \) \(\cos 2x = 1 - 2\sin^2 x \) |
| 3 |
\(\tan 2x = \dfrac{2 \tan x}{1 - \tan^2 x} \) |
| No | Rumus |
| 1 |
\(\sin 3x = 3 \sin x - 4 \sin^3 x \) |
| 2 |
\(\cos 3x = 4\cos^3 x - 3 \cos x \) |
| 3 |
\(\tan 3x = \dfrac{3 \tan x - \tan^3 x}{1 - 3 \tan^2 x}\) |
| No | Rumus |
| 1 |
\(\cos^2 x = \frac{1}{2} + \frac{1}{2} \cos 2x \) |
| 2 |
\(\sin^2 x = \frac{1}{2} - \frac{1}{2} \cos 2x \) |