TeX Quellcode:

\begin{array}{rclcl} \cos(\beta) &=& \dfrac{a}{c} & \vert & \cdot c \cr c \cdot \cos(\beta) &=& a & \vert & : \cos(\beta) \cr c &=& \dfrac{a}{\cos(\beta)} \cr\cr c &\approx& \dfrac{5}{\cos(1{,}01)} \cr c & \approx & 9{,}40 \, cm \end{array}