conic-section

Question: The one which does not represent a hyperbola is



1) $xy=1$
2) ${{x}^{2}}-{{y}^{2}}=5$
3) $(x-1)(y-3)=3$
4) ${{x}^{2}}-{{y}^{2}}=0$
Solution: Explanation: No Explanation
Hyperbola

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