Let \( x \) and \( y \) be two real numbers such that \( x0 \) and ...

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Let \( x \) and \( y \) be two real numbers such that \( x0 \) and \( x y=1 \). The minimum value of \( x+y \) is
(a) 1
(b) \( 1 / 2 \)
(c) 2
(d) \( 1 / 4 \)
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