Straight LineHard
Question
= 1 is a variable line such that 
. The locus of the foot of perpendicular from origin to the line is-Options
A.x2 + y2 − ax − by = 0
B.x2 + y2 + ax + by = a2 + b2
C.x2 + y2 = k2
D.x2 − y2 = 2k2
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