A. k/h2+k2

B. hk/√h2+k2

C. 2hk/h2+k2

D. 2hk/√h2+k2

If the pole of a line w.r.to the circle x^{2}+y^{2}=a^{2 }lies on the circle x^{2}+y^{2}=a^{4 }then the line touches the circle

Let C be the circle with centre (0, 0) and radius 3 units. The equation of the locus of the midpoints of the chords of the circle C that subtend an angle of 2π/3 at its centre is

The equations of the tangents to the circle x^{2}+y^{2}+8x-4y-5=0 and perpendicular to 2x+3y+5=0 are

For the circle2x^{2}+2y^{2}-5x-4y-3=0, the point (4, 2)

If the lines 2x+y+12=0, kx-3y-10=0 are conjugate w.r.t the circle x^{2}+y^{2}-4x+3y-1=0, then k=