function Ve_DoThiTrongKhongGian_3D()

clc;

x = [-5:0.5:5];

y = x;

[x,y] = meshgrid (x,y);

z = sin(sqrt(x.^2 + y.^2))./(x.^2 + y.^2);

plot3 (x,y,z)

surf (x,y,z)

xlabel ('Truc x')

ylabel ('Truc y')

zlabel ('Truc z')

title ('Do thi ham so z = sin(sqrt(x^2 + y^2)) / (x^2 + y^2)')

rotate3D on

grid on

box on

legend ('z')

hidden off