\usemodule[mathml] \starttext \startplaceformula \startformula \xmlprocessdata{}{

[\begin{matrix} R_{1 x} \\ R_{1 y} \\ F_{2 x} \\ F_{2 y} \\ R_{3 x} \\ R_{3 y} \\ R_{4 x} \\ R_{4 y} \end{matrix}] = [\begin{matrix} \frac{A_{1} E_{1}}{L_{1}} & 0 & - \frac{A_{1} E_{1}}{L_{1}} & 0 & 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\ - \frac{A_{1} E_{1}}{L_{1}} & 0 & \frac{A_{1} E_{1}}{L_{1}} + \frac{A_{3} E_{3}}{5 L_{3}} & - \frac{2 A_{3} E_{3}}{5 L_{3}} & 0 & 0 & - \frac{A_{3} E_{3}}{5 L_{3}} & \frac{2 A_{3} E_{3}}{5 L_{3}} \\ 0 & 0 & - \frac{2 A_{3} E_{3}}{5 L_{3}} & \frac{A_{2} E_{2}}{L_{2}} + \frac{4 A_{3} E_{3}}{5 L_{3}} & 0 & - \frac{A_{2} E_{2}}{L_{2}} & \frac{2 A_{3} E_{3}}{5 L_{3}} & - \frac{4 A_{3} E_{3}}{5 L_{3}} \\ 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & - \frac{A_{2} E_{2}}{L_{2}} & 0 & \frac{A_{2} E_{2}}{L_{2}} & 0 & 0 \\ 0 & 0 & - \frac{A_{3} E_{3}}{5 L_{3}} & \frac{2 A_{3} E_{3}}{5 L_{3}} & 0 & 0 & \frac{A_{3} E_{3}}{5 L_{3}} & - \frac{2 A_{3} E_{3}}{5 L_{3}} \\ 0 & 0 & \frac{2 A_{3} E_{3}}{5 L_{3}} & - \frac{4 A_{3} E_{3}}{5 L_{3}} & 0 & 0 & - \frac{2 A_{3} E_{3}}{5 L_{3}} & \frac{4 A_{3} E_{3}}{5 L_{3}} \end{matrix}] [\begin{matrix} 0 \\ 0 \\ u_{2 x} \\ u_{2 y} \\ 0 \\ 0 \\ 0 \\ 0 \end{matrix}]

}{} \stopformula \stopplaceformula \stoptext