equation of normal to ellipse in parametric form

Equation of Normal to ellipse : $x^2\over a^2$ + $y^2\over b^2$ = 1 (a) Point form : The Equation of normal to the given ellipse at ($x_1, y_1$) is $a^2x\over x_1$ + $b^2y\over y_1$ = $a^2-b^2$ = $a^2e^2$ Example : Find the normal to the ellipse $9x^2+16y^2$ = 288 at the point (4,3). Solution : […]