The curve \( x y=c,(c0) \), and the circle \( x^{2}+y^{2}=1 \) touc...

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The curve \( x y=c,(c0) \), and the circle \( x^{2}+y^{2}=1 \) touch at two points. Then the distance between the points of contacts is
W
(1) 1
(2) 2
(3) \( 2 \sqrt{2} \)
(4) none of these
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