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(product of (1998^2 - i^2) from i = 0 to 1996) / (product of (1997^2 - i^2) from i = 0 to 1996)
(product of (1998^2 - i^2) from i = 0 to 1996) / (product of (1997^2 - i^2) from i = 0 to 1996)
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