I need help to plot my derivate of the folium

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clearvars
syms t
X(t)=3*t./(1+t.^3);
Y(t)=3*(t.^2)./(1+t.^3);
%Primeira Derivada
Dx = diff(X,t);
Dy = diff(Y,t);
D(t) = simplify(Dy ./ Dx)
%Segunda Derivada
Dx2 = diff(diff(X,t));
Dy2 = diff(diff(Y,t));
D2(t) = simplify(Dy2 ./ Dx)
%Gráfico do Folium
x = [linspace(-50,-1.1,10000) , linspace(-0.9,50,10000)];
scatter(X(x),Y(x))
%plot(Dy ./ Dx);
d = [linspace(-5) , linspace(-0.9)];
scatter(Dx(d), Dy(d))

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