A. x2/a2+y2/b2=1/a2
B. x2/a2+y2/b2=1/b2
C. x2/a4+y2/b4=1/a2
D. x2/a4+y2/b4=1/b2
If the line lx+my=1 is a normal to the ellipse x2/a2+y2/b2=1 then a2/l2-b2/m2=1
The radius of the circle passing through the foci of the ellipse x2/16+y2/9=1 and having its center at (0, 3) is
If x and y are strictly positive such that x+y =1,then the minimum value of x log x + y log y is
The locus of middle point of the chord of the ellipse x2/a2+y2/b2=1 touching the ellipse The locus of midpoint of the chord of the ellipse x2/α2+y2/β2=1
The points on the ellipse x2/25+y2/9=1 whose angles differ by a right angle are
The chord of contact of tangents drawn from points on x2/a2+y2/b2=1 to the circle x2+ y2=c2 touches the ellipse
The tangents are drawn to the ellipse x2/a2+y2/b2=1 at point where it is intersected by the line lx+my+n=0. The point of intersection of tangents at these points is
If the lines 4x+3y-1=0,x-y+5=0 and kx+5y-3=0 are concurrent,then k is equal to
The product of the slopes of the tangents to the ellipse 2x2+3y2=6 draw from the point (1, 2) is
The ordinate PN of P(a cos θ, b sin θ) on the ellipse x2/a2+y2/b2=1 meets the auxiliary circle at Q,. The locus of the point of intersection of normal at P and Q is