Equation \( a x^{2}+2 h x y+b y^{2}+2 g x+2 f y+c=0 \) \( \mathrm{P...

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Equation \( a x^{2}+2 h x y+b y^{2}+2 g x+2 f y+c=0 \)
\( \mathrm{P} \) \( \left(a b c+2 f g h-a f^{2}-b g^{2}-c h^{2} \neq 0\right) \) represents a

W parabola, if
(1) \( h^{2}=a b \)
(2) \( h^{2}a b \)
(3) \( h^{2}a b \)
(4) None of these
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