Find the displacements and forces in the truss structure. The Young's modulus is $E={10}^{11}Pa,$ the cross sectional area of all bars is ${10}^{-2}{m}^2,$ forces $F={10}^{3}N.$ Remember to exploit symmetry in the solution of this problem. Show your workings by forming each individual stiffness matrix, forming the overall

stiffness matrix and solving for unknown displacements. Then find the forces and stresses in each truss member.