If the normal at \( \left(x_{i}, y_{i}\right), i=1,2,3,4 \) on the ...

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If the normal at \( \left(x_{i}, y_{i}\right), i=1,2,3,4 \) on the
P rectangular hyperbola \( x y=c^{2} \) meet at the point

W \( (\alpha, \beta) \), then
(1) \( \sum x_{i}=\alpha \)
(2) \( \Sigma y_{i}=\beta \)
(3) \( \sum x_{i}^{2}=\alpha^{2} \)
(4) \( \Sigma y_{i}^{2}=\beta^{2} \)
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