Problem N $3$ : $(06$ pts$)$

Use the displacement method and the FEM method to compute the rotations ${}_1$ and ${}_2,$ and var${}_1$ the deflections of this beam. Then compute the reactions at B and C $.$ Construct the shear and moment diagrams. Assume that : $L=10m$;$E=2\mathrm{.}1x{10}^{11}Pa$;$I=1200c{m}^4$;