A. x2/a2+y2/b2=xh/a2+yk/b2

B. x2/a2+y2/b2=xh/a2-yk/b2

C. x2/a2-y2/b2=xh/a2+yk/b2

D. x2/a2-y2/b2=xh/a2-yk/b2

The equation of the auxiliary circle of x^{2}/12+y^{2}/18=1 is

If the chord of contact of the point (1, -2) with respect to the ellipse 4x^{2}+5y^{2}=20 is ax+by+c=0 then the ascending order of a, b, c is

The locus of a point P for which the chord of contact of x^{2}/a^{2}+y^{2}/b^{2}=1 touch the circle x^{2}+y^{2}=r^{2}

The value of k if (1, 2) (k, -1) are conjugate points with respect to the ellipse 2x^{2}+3y^{2}=6 is

Pole of the line 2x+3y+4=0 w.r.to the ellipse x^{2}/2+y^{2}/4=1 is