[MP PET 1992]
A) $ xy=1 $
B) $ x^{2}-y^{2}=5 $
C) $ (x-1)(y-3)=3 $
D) $ x^{2}-y^{2}=0 $
Correct Answer: D
For hyperbola $ \Delta \ne 0 $ and $ h^{2}>ab $ . Here $ \Delta =0 $ .
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