The pole of the line $$\frac{x}{a}+\frac{y}{b}=1$$ with respect to the circle $$x^2+y^2=c^2$$ is

If the tangent at the point $$P$$ on the circle $$x^2+y^2+6 x+6 y=2$$ meets the straight line $$5 x-2 y+6=0$$ at a point $$Q$$ on the $$Y$$-axis, then the length of $$P Q$$ is

The equation of the pair of straight lines parallel to $$x$$-axis and touching the circle $$x^2+y^2-6 x-4 y-12=0$$ is

The points where the circle $$x^2+y^2-3 x -4 y+2=0$$ cuts the $$X$$-axis are