If `ax^2 + by^2 + 2hxy + 2gx + 2fy + c = 0` represents an ellipse, then `h^2 lt ab and abc +2fgh-at^2-bg^2-ch^2 != 0`. If for every point `(x_1,y_1)` satisfying above equation onthen `(2h-x_1,2k-y_1)` also satisfy it,then `(h,k)` is centre of it. The length of semi major axis andmaximum and minimum value of the distance of a point lying on the curve from its centre..For the ellipse `2x^2 - 2xy + 4y^2 - (3 + sqrt2) = 0`, the bindination of major axis of it with x-axis is