"f(x,y)=\\frac{x^2y^3}{x^4}+y^2=\\frac{y^3}{x^2}+y^2"
Let the unit vector be <a,b>
"D_uf(x,y)=-2x^{-3}y^3.a+(\\frac{3y^2}{x^2}+2y).b"
"D_uf(0,0)=0"
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