Any chord passing through the focus (ae, 0) of the hyperbola x2−y2=a2is conjugate to the line
ex - a = 0
ae + x = 0
ax + e = 0
ax - e = 0
S1=0
The locus of the mid points of the chords of the circle x2+y2−ax−by=0 which subtend a right angle at (a2,b2) is :