If the line \( a x+b y+c=0 \) is a normal to the \( \mathrm{P} \) h...

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If the line \( a x+b y+c=0 \) is a normal to the
\( \mathrm{P} \) hyperbola \( x y=1 \), then

W
(1) \( a0 \quad b0 \)
(2) \( a0 \quad b=0 \)
(3) \( a0 \quad b0 \)
(4) \( a0 \quad b0 \)
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