Question: Let us focus only on Elemnt 1 in this problem. For this element, the modulus of elasticity is E, the length is L, and the

Let us focus only on Elemnt 1 in this problem. For this element, the modulus of elasticity is E, the length is L, and the cross sectional area decreases linearly from A1 at node 1, which is at x=0, to A2 at node 2 which is at x=L. Using the linear Lagrange interpolation functions, derive the stiffness matrix k for this element

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