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Both Galerkin formulation and collocation formulation are constructed to determine the expansion coefficients. In Galerkin formulation, the flux jump condition can be imposed by the weak formulation naturally. In collocation formulation, the results obtained by B\u2010polynomials expansion are compared with that obtained by Lagrange basis expansion. Numerical experiments show that B\u2010polynomials expansion is superior to Lagrange expansion in both condition number and accuracy. 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