1)
x(f,v)=sqrt(((2+u*cos(u)))^2 + (2+u*cos(u))^2)*sin(v)
y=g(u,v)=u
z=h(u,v)=sqrt(((2+u*cos(u)))^2 + (2+u*cos(u))^2)*cos(v)
2)
x=f(u)=(2+u*cos(u))
y=g(u)=u
z=h(u)=2+u*cos(u)
