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453 Example 7.20. Using Lagrange's formula, express the function of partial fractions. 3x + x + 1 (x - 1) (x - 2)(x - 3) as a sum 453 Example 7.20. Using Lagrange's formula, express the function of partial fractions. 3x + x + 1 (x - 1) (x - 2)(x - 3) as a sum