TeX Quellcode:

\begin{array}{rclcl} \sin(\beta) &=& \dfrac{b}{c} & \vert & \cdot c \cr c \cdot \sin(\beta) &=& b & \vert & : \sin(\beta) \cr c &=& \dfrac{b}{\sin(\beta)} \cr c &=& \dfrac{12}{\sin\left(\dfrac{\pi}{6}\right)} \cr c &=& 24 \, cm \end{array}