A. x2/a4+y2/b4=1/r4

B. x2/a4+y2/b4=1/r2

C. y2/a4+x2/b4=1/r2

D. x2/a4+y2/b4=-1/r2

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

The equation of the normal at a point hose eccentric angle is 3π/2+θ to the ellipse x^{2}/9+y^{2}/4=1 is

If 2x-y+3=0, 4x+ky+3=0 are conjugate with respect to the ellipse 5x^{2}+6y^{2}-15=0 then k=

P(θ) and D(θ+π/2) are two points on the ellipse x^{2}/a^{2}+y^{2}/b^{2}=1. The locus of point of intersection of tangents at P and D to the ellipse is