If \( l x+m y+n=0 \) is a tangent to the rectangular \( \mathrm{P} ...

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If \( l x+m y+n=0 \) is a tangent to the rectangular
\( \mathrm{P} \) hyperbola \( x y=c^{2} \), then

W
(1) \( lm0 \)
(2) \( l0, m0 \)
(3) \( l0, m0 \)
(4) None of these
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