Show the parametric equation graph

x=e^-t cos(8t), y=e^-t sin(8t), z=e^-t

(b) x=t,y=1/1+t^2 ,z=t^2

(c) x=cos(4t), y=t, z= sin(4t)

(d)=x=t,y=t^2 ,z=e^-t