A) Circle
B) Parabola
C) Straight line
D) None of these
Correct Answer: C
Solution :
\[t_{1}^{2}-t_{2}^{2}=k\Rightarrow {{S}_{1}}-{{S}_{2}}=k\Rightarrow \]1st degree equation which represents a straight line parallel to radical axis\[{{S}_{1}}-{{S}_{2}}=0\].
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