1.

Distance between the pair of lines represented by the equation \[{{x}^{2}}-6xy+9{{y}^{2}}+3x-9y-4=0\]is  [Kerala (Engg,) 2002]

A.            \[\frac{15}{\sqrt{10}}\]    
B.            \[\frac{1}{2}\]
C.            \[\sqrt{\frac{5}{2}}\]        
D.            \[\frac{1}{\sqrt{10}}\]
Answer» D.            \[\frac{1}{\sqrt{10}}\]


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