If \( x0 \) and \( x y=1 \), the minimum value of \( (x+y) \) is \(...

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If \( x0 \) and \( x y=1 \), the minimum value of \( (x+y) \) is
\( \mathrm{P} \)
(a) \( -2 \)
(b) 1
(c) 2
(d) none of these
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