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If (x^(+(1)/(2)) + x^(-(1)/(2)))^(2) = (...

If `(x^(+(1)/(2)) + x^(-(1)/(2)))^(2) = (9)/(2)`, then find the value of `(x^((1)/(2))-x^(-(1)/(2)))` for ` x gt 1`.

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