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7. Describe the method for solving the linear two-point boundary value problem u"(x) + g(x)u'(x) + h(x)u(x) = f(x), 0 < x < 1 u(0) = a, u(1) = ß where f(x), g(x) and h(x) are given functions, and a, ß are given real numbers. = =