Solve Problem 3.55 for the axial displacement in the bar using collocation, sub-domain, least squares, and Galerkin's

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Solve Problem 3.55 for the axial displacement in the bar using collocation, sub-domain, least squares, and Galerkin's methods. Choose a quadratic polynomial u(x) = c1x + c2x2 in each method. Compare these weighted residual method solutions to the exact solution?

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