A. 600

B. Tan-1(1/2)

C. Tan-1(3/5)

D. 1350

The nearest point on the circle x^{2}+y^{2}-6x-4y-12=0 from (-5, 4) is

The equation of the tangents to a circle x^{2}+y^{2}-4x-6y-12=0 and parallel to 4x-3y=1 are

The equation of the chord of the circle x^{2}+y^{2}=25 with (1, -1) as the midpoint is

The equations to the direct common tangents to the circles x^{2}+y^{2}+22x-4y-100=0, x^{2}+y^{2}-22x+4y+100=0is

If the equation of the circle cutting the circle x^{2}+y^{2}+2x-4y+8=0 orthogonally and coaxal with the circles x^{2}+y^{2}+6x+4y-12=0, x^{2}+y^{2}-4x-6y-12=0 is x^{2}+y^{2}+2ax+2by+c=0 then the ascending order of a, b, c is