4) Consider the unit tangent vector T(s) on the curve C as a function of the arc length s: Calculate the torsion T for the curve C. \vec{T}(s)=\frac{1}{3}[2 \vec{\imath}+-\sqrt{5} \sin

(3 t) \vec{\jmath}+\sqrt{5} \cos (3 t) \vec{k}]