
Bewijs zonder woorden 65-1
$$\color{red}{\sin(\alpha + \beta)} = \sin(\alpha)\cos(\beta)+\cos(\alpha)\sin(\beta)$$
$$\color{\green}{\cos(\alpha + \beta)} = \cos(\alpha)\cos(\beta)-\sin(\alpha)\sin(\beta)$$
$$\color{red}{\sin(\alpha + \beta)} = \sin(\alpha)\cos(\beta)+\cos(\alpha)\sin(\beta)$$
$$\color{\green}{\cos(\alpha + \beta)} = \cos(\alpha)\cos(\beta)-\sin(\alpha)\sin(\beta)$$