A. 2ax+2by+(a2+b2+4)=0

B. 2ax-2by-(a2+b2+4)=0

C. 2ax-2by+(a2+b2+4)=0

D. 2ax+2by-(a2+b2+4)=0

The line 4x+4y-11=0 intersects the circle x^{2}+y^{2}-6x-4y+4=0 at A and B. The point of intersection of the tangents A, B is

If 4l^{2}-5m^{2}+6l+1=0, then the line lx+my+1=0 touches the circle

The equation of the circle whose radius is 5 and which touches the circle x^{2}+y^{2}-2x-4y-20=0 at the point (5, 5) is

A: The polar of (2, 3) with respect to the circle x^{2}+y^{2}-4x-6y+5=0 is 2x+3y=0

R: The polar of (x_{1}, y_{1}) with respect to the circle S=0 is S_{1}=0

The locus of poles of tangets to the circle (x-p)^{2}+y^{2}=b^{2} w.r.t the circle x^{2}+y^{2}= a^{2} is