A. Cos-1 3/5

B. Cos-1 2/3

C. Cos-1 1/3

D. Cos-1 1/5

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

The total number of real tangents that can be drawn to the ellipse 3x^{2}+5y^{2}=32 and 25x^{2}+9y^{2}=450 passing through (3, 5) is

If the equation of the pair of tangents drawn from (1, 2) on the ellipse x^{2}+2y^{2}=2 is 3x^{2}-4xy-y^{2}+ax+by+c=0 then the ascending order of a, b, c is

The pole of the line y=x+2 e with respect to the ellipse x^{2}+4y^{2}-2x-6y-10=0 is

The equation of ellipse whose focus is (0, √a^{2}-b^{2}), directrix is y=a^{2}/√a^{2}-b^{2 }and eccentricity is √a^{2}-b^{2}/a is