Straight LineEasy
Question
If the equation x2 + y2 + 2gx + 2fy + 1 = 0represents a pair of lines, then -
Options
A.f2 + g2 =1
B.g2 − f2 =1
C.f2 − g2 = 1
D.f2 + g2 = 1/2
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