The foci of an ellipse are S, S' and P is any point on the curve. The normal at P meets SS' at G. Prove the
where e is the eccentricity of the ellipse.
I let P(s,t)
the equation of the ellipse
S(ae,0) and s'(-ae,0)
gradient of normal at P=
Now my problem is here, i cannot find a square root for this expression.