Solve the rigid plane frame shown in Figure. The frame is fixed at nodes $1$ and $3$ and subjected to a distributed load of $1$kN$/$m applied downward over element $2.$ The global coordinate axes have been established at node $1.$ The element lengths are shown in the figure. Let E$=70$GPa, cross section is circular with $100$ mm diameter for both elements of the frame. find the displacements at node $2$ and the reaction forces at nodes $1$ and $3.$ angle is $60$ degree.