A. x=0, (f2-g2)x-2fgy=0
B. x=0, (f2+2g2)x-2fgy=0
C. x=2, (2f2+3g2)x+2fgy=0
D. x=5, (3f2+5g2)x+2fgy=0
The area of the triangle formed by the tangents from (1, 3) to the circle x2+y2-4x+6y+1=0 and its chord of contact is
The condition that the pair of tangents drawn from (g, f) to the circle x2+y2+2gx+2fy+c=0 may be at right angles is
The equation of the circle passing through the points of intersection of the circles x2+y2-8x+10y+2=0, x2+y2-3x+5y-1=0 and touching line 2x+y=3 is
The equation of the circle passing the origin having its centre on the line x+y=4 and cutting the circle x2+y2-4x+2y+4=0 orthogonally is
The limiting points of the coaxal system x2+y2+2λx+4=0 are
The equation of the circle passing through (2, 1) and touching the coordinate axes is
The length of the tangent from the point (-1, 1) to the circle x2+y2-4x+k=0 is equal to 2 then k=
The equations of the tangents to the circle x2+y2=16 which are inclined at an angle of 600 to the x-axis is
The common chord of x2+y2-4x-4y=0 and x2+y2=16 substends at the origin an angle equal to
The conjugate line of 3x+4y-45=0 with respect to x2+y2-6x-8y+5=0 which is perpendicular to x+y=0 is