function plot3521

figure(1)
t=0:pi/50:10*pi;
plot3(cos(t),sin(t),t)

figure(2)
t=[0:pi/100:2*pi];
x=[sin(t) sin(t)];
y=[cos(t) cos(t)];
z=[(sin(t)).^2+(cos(t)).^2  (sin(t)).^2+(cos(t)).^2+1];
plot3(x,y,z)