A) \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+k=0\]
B) \[{{x}^{2}}-{{y}^{2}}+2gx+2fy+k=0\]
C) \[{{x}^{2}}+{{y}^{2}}+2xy+2gx+2fy+k=0\]
D) None of these
Correct Answer: A
Solution :
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