sir i didnot know how to find number normals to ellipse,parabola,hyperbola,circle

To find equation of normal in slope form simply differentiate the curve find dy/dx that is slope of tangent now slope of normal is -dx/dy and a point must be given in question on which normal has to be drawn use this point to find equation of line in slope form
y-y₁=m(x-x₁)
To find in parametric form replace (x₁y₁) by parameters according to the curve

Thanks and Regards
deepak shringi
askiitians