f(x) is a natural cubic spline function having knots {-2, 0, 1), defined by ƒ(x) = { g(x), arª+x³+ ßr², € [-2,0], r¤ [0,1], where a and 3 are real parameters and g(x) is some function. Determine the values for a, 3, and f'(1/2).

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