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(X - 5 - (-1)) * (X - 1 - 5) - (X - 1 - 5)^2/2 = (X - 1)^2/2
(X - 5 - (-1)) * (X - 1 - 5) - (X - 1 - 5)^2/2 = (X - 1)^2/2
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