\( \mathrm{P} \) The equation \( a x^{2}+2 h x y+b y^{2}+2 g x+2 f ...
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\( \mathrm{P} \)
The equation \( a x^{2}+2 h x y+b y^{2}+2 g x+2 f y+c=0 \)
W rectangular hyperbola if
(1) \( \Delta \neq 0, h^{2}a b, a+b=0 \)
(2) \( \Delta \neq 0, h^{2}a b, a+b=0 \)
(3) \( \Delta \neq 0, h^{2}=a b, a+b=0 \)
(4) None of these
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