lab12

t = -5:0.01:5;
x = 3*cos(t).^3;
y = 2*sin(t).^3;
plot(x,y,1);

T = -3:0.01:3;
Y = (e.^T+e.^-T)/2;
plot(Y);
#Curbe 3D

t = -8:0.01:10;
x = 3+3*cos(t);
y = 3*sin(t);
z = 6*sin(t/2);

plot3(x,y,z,1);

#mesh
x = -8:0.01:8;
[Z,Y] = meshgrid(x); #generare coordonate
z = sin(sqrt(Z.^2+Y.^2))./sqrt(Z.^2+Y.^2);
mesh(Z,Y,z); #reprezentare suprafata

figure(2);
surf(Z,Y,z);