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inverse of f(x,A,B,C,D) = (A * x^3) + (B * 3 * x^2 * (1-x)) + (C * 3 * x(1-x)^2) + (D * (1-x)^3)
inverse of f(x,A,B,C,D) = (A * x^3) + (B * 3 * x^2 * (1-x)) + (C * 3 * x(1-x)^2) + (D * (1-x)^3)
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