20. Use FEM to solve the two plane truss problems shown in the figure below. Assume AE...

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20. Use FEM to solve the two plane truss problems shown in the figure below. Assume AE = 106 N, L = 1 m. Before solving the global equations [K]{Q} = {F}, find the determinant of [K]. Does [K] have an inverse? Explain your answer.

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