function Ve_DoThiTrongKhongGian_3D_Bai2()

clc;

x = [-5:0.5:5];

y = x;

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

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

surf (x,y,z)

box on

grid on

xlabel ('Truc x')

ylabel ('Truc y')

zlabel ('Truc z')

legend ('z')

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

rotate3D on

hidden off