The line segment joining the foci of the hyperbola `x^2 – y^2 +1 = 0` is one of thediameters of a circle. The equation of the circle is

The line segment joining the foci of the hyperbola x^(2)-y^(2)+1=0 is one of the diameters of a circle. The equation o f the circle is

The foci of the hyperbola 4x^(2)-9y^(2)-1=0 are

The foci of the hyperbola 4x^(2)-9y^(2)-1=0 are

One of the foci of the hyperbola (x ^(2))/( 16) - (y ^(2))/(9) =1 is

Equation of the line joining the foci of the parabola y^(2)=4x and x^(2) = -4y is

The circle described on the line joining the foci of the hyperbola (x^(2))/(16)-(y^(2))/(9) = 1 as a diameter passes through an end of the latus rectum of the parabola y^(2) = 4ax , the length of the latus rectum of the parabola is

The equation of the circle drawn on the line segment joining the foci of the two parabolas x ^(2) = 4ayand y^(2) =4a(x-a) as a diameter is-

The circle drawn on the line segment joining the foci of the hyperbola x^2/a^2-y^2/b^2=1 as diameter cuts the asymptotes at (A) (a,a) (B) (b,a) (C) (pmb,pma) (D) (pma,pmb)