David Underhill – P710 #13, 15

 

>  with(plots):

 

>  spacecurve( [t, cos(2*t), sin(2*t)], t=-2*Pi..2*Pi, color=blue, axes=normal); #P710 #13

 

 

>  spacecurve( [sin(t), 3, cos(t)], t=-2*Pi..2*Pi, color=blue, axes=normal); #P710 #15M