A. x2+y2+µ(x/a+y/b+2)=0

B. x2+y2+(2a-2aλ)x+(2b+2bλ)y=0

C. x2+y2+(2a-2aλ)x+(2b-2bλ)y=0

D. x2+y2+(2a+2aλ)x+(2b+2bλ)y=0

The locus of the midpoint of the chord of the circle x^{2}+y^{2}-2x-2y-2=0, which makes an angle of 120^{0} at the centre is

Let A and B be two fixed points, If a perpendicular p is drawn from A to the polar of B with respect to the circle x^{2}+y^{2}=a^{2} and perpendicular q is drawn from B to the polar of A then

The circle x^{2}+y^{2}=4 cuts the circle x^{2}+y^{2}-2x-4=0 at the points A and B. If the circle x^{2}+y^{2}-4x-k=0 passes through A and B then the value of k is

The equation of the circle passing through (-7, 1) and having centre at (-4, -3) is

The system of circles orthogonal to x^{2}+y^{2}+2x+4y+7=0 is a member, then the equation of the orthogonal system is