# How to write twisted cubic in sage?

Hello

could you please tell me how can I write twisted cubic

( {cost,sint | t in R}= v(x^2+y^2-1) )

in sage? should I use subscheme command and introduce it as an affine variety?

Your equation looks like a circle... What do you mean by "write" ? What do you want to do with your object ? Plot it ? Compute rational points ?

The twisted cubic in parametric form is: var('t'); parametric_plot3d((t,t^2,t^3),(t,0,4),thickness=3)

should I introduce affine space then use v.rational_points( bound=..) ?