Question
a lu'en
Let eq of Nomal
( y-k=-frac{d y}{d y}(x-k) )
grum ( int frac{1 frac{d x}{d y}+k}{sqrt{left(frac{d x}{d y}right)^{2}+1}}= )
( n^{2}left(frac{d x}{d y}right)^{2}+x^{2}+2 n k frac{d x}{d y}=k^{2}left(frac{d x}{14}right)^{2} )
( +k^{2} )
So eq of curve
( frac{x^{2}}{m^{2}}+frac{2 x y}{m}=frac{y^{2}}{m^{2}} )
( operatorname{sen} x^{2}+2 x y m=y^{2} )
( m=frac{y^{2}-x^{2}}{2+y} )
( frac{d y}{d x}=frac{y^{2}-x^{2}}{2 x y} )

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Solution
