A. (x2/a2+y2/b2)2= (x2+y2)/a2

B. (x2/a2+y2/b2)2= (x2-y2)/a2

C. (x2/a2-y2/b2)2= (x2+y2)/a2

D. (x2/a2-y2/b2)2= (x2-y2)/a2

The midpoint of a chord 4x+5y-13=0 of the ellipse 2x^{2}+5y^{2}=20 is

The equation of the chord of the ellipse 2x^{2}+3y^{2}=6 having (1, -1) as its midpoint is

The locus of the poles of chords of the ellipse x^{2}/a^{2}+y^{2}/b^{2}=1 which touch The locus of the poles w.r.t the ellipse x^{2}/α^{2}+y^{2}/β^{2}=1 is

The tangent and normal to the ellipse 4x^{2}+9y^{2} =36 at a point P on it meets the major axis in Q nd R respectively. If QR=4, then the eccentric angle of P is

If the polar of (2, -1) with respect to the ellipse 3x^{2}+4y^{2}=12 is ax+by+c=0 then the ascending order of a, b, c is