For this problem, derive the optimization formulation including the objective function and constraints and then use Matlab linprog to solve it The limit design of the five bar truss shown in Figure is formulated as minimizing the weight of truss subjected to equilibrium and stress constraints. The design variables are both the cross-sectional areas and the member forces. Assume that all bars are made of the same material with ρ = 1, and yield stress σ0 = 1 l l = 1 P=1