A circle cuts the rectangular hyperbola \( x y=1 \) in the \( \math...

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A circle cuts the rectangular hyperbola \( x y=1 \) in the
\( \mathrm{P} \) points \( \left(x_{\mathrm{r}}, y_{\mathrm{r}}\right), r=1,2,3,4 \). Then the values of

W \( x_{1} x_{2} x_{3} x_{4} \) and \( y_{1} y_{2} y_{3} y_{4} \), respectivel \( y \), are
(1) \( -1,-1 \)
(2) \( -1,1 \)
(3) \( 1,-1 \)
(4) 1,1
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