TeX Quellcode:

\begin{array}{rcl}\alpha + \beta &=& 30^\circ+\dfrac{\pi}{3} \\\\\alpha + \beta &=& \dfrac{\pi}{6} +\dfrac{\pi}{3} \\\\\alpha + \beta &=& \dfrac{\pi}{2} \\\\\alpha + \beta & < & \pi \\\end{array}