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The domain of f(x) such that the f(x) = ...

The domain of `f(x)` such that the `f(x) = [[x + 1/2]] / [[x - 1/2]]` is prime is `[X_1, X_2)`, then the value of `2(x_1 ^2 + x_2 ^2)` Where [.] denotes greatest integer function less than or equal to x]

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