Find the equation of the ellipse whose centre is at the origin, foci are `(1,0)a n d(-1,0)` and eccentricity is 1/2.

Find the equation of the ellipse whose centre is at the origin,foci are (1,0) and (-1,0) and eccentricity is 1/2 .

Find the equation of the ellipse whose vertices are (pm2,0) and foci are (pm1,0) .

Find the equation of the ellipse whose vertices are (pm2,0) and foci are (pm1,0) .

Find the equation of the ellipse whose centre is at origin, the distance between foci is 2 and eccentricity is (1)/(sqrt(2)) .

Find the equation of the ellipse whose centre is at origin, the distance between foci is 2 and eccentricity is (1)/(sqrt(2)) .

Find the equation of the ellipse whose axes are along the coordinate axes, foci at (0,\ +-4) and eccentricity 4/5.

Find the equation of the ellipse whose axes are along the coordinate axes,foci at (0,+-4) and eccentricity 4/5.

Find the equation of the ellipse whose centre is the origin, major axis 9/2 and eccentricity 1/sqrt(3) where the major axis is the horizontal axis.

Find the equation of the ellipse whose eccentricity is 1/2 and whose foci are at the points (pm2, 0) .

Find the equation of the ellipse whose focus is (1,-1), the corresponding directrix is x-y-3=0, and eccentricity is 1/2 .