TeX Quellcode:
\begin{array}{rclcl} \sin(\alpha) &=& \dfrac{a}{c} & \vert & \cdot c \cr a &=& c \cdot \sin(\alpha) \cr a &=& 5 \cdot \sin(15^{\circ}) \cr a &\approx& 1{,}29 \, cm \end{array}