# Math Help - Torsion - Vector Algebra - urgent kinda

1. ## Torsion - Vector Calculus - urgent kinda

Question :- Find the torsion of $C : r(t) = [t, t^2, t^3]$

Strategy :- First convert into $r(s)$. Then find $u(s)$ (unit tangent vector). Then find the $b(s)$ (unit binormal vector). Then take its derivative and game is up.

Problems :- But....a biiiig BUT....I am stuck ....Till now I have done problems in which there were equations of circles and elipses etc and it was easier to convert them into parametric form and then conert into $r(s)$...here I am atuck with these $t$s....

Questions :- 1. How do I write the parametric forms and convert them from $t$ to $s$ ?
2. How do I find the unit normal vector vector with which I have to cross the unit tangent vector ?