A) Two parallel straight lines
B) Two perpendicular straight lines
C) Two coincident lines
D) None of these
Correct Answer: A
Solution :
\[f(x,y)=0\] gives us an equation \[\Delta =0\]gives us a pair of straight lines. \[{{h}^{2}}=ab\] gives angle between them equal to zero. Hence equation represents two parallel lines.
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