a) Find the parametric equations for the curved helix curve on the cylinder x^2+y^2=4 and bass theough (2,0,0) ) and (\sqrt{2},\sqrt{2},\sqrt{2}) Is there more than one round snail of this kind?

b)Find the tangent and vertical plane equations at any optional point of the curve x(t)=(6t,3t^2,t^3)