A. x2+y2-2x+2y+1=0

B. x2+y2+2x+2y+1=0

C. x2+y2-2x-2y-1=0

D. x2+y2-2x+2y-1=0

The length of the tangent from the point (-1, 1) to the circle x^{2}+y^{2}-4x+k=0 is equal to 2 then k=

The equations of the tangents to the circle x^{2}+y^{2}=16 which are inclined at an angle of 60^{0} to the x-axis is

The common chord of x^{2}+y^{2}-4x-4y=0 and x^{2}+y^{2}=16 substends at the origin an angle equal to

The conjugate line of 3x+4y-45=0 with respect to x^{2}+y^{2}-6x-8y+5=0 which is perpendicular to x+y=0 is

The equation of the circle having a radius 2 and passing through the limiting points of the coaxal system x^{2}+y^{2}-6-2λ(x+y-4)=0 is