The Frenet frame formula says that the first derivation of the equation $q(t)$ is my view:
$$q'(t) = \verb|vec_view|$$
the cross product of derivation one and two $q' \times q''$ is my binominal vector
In some formulary, equations are only derived like $$\verb|vec_view| = q',$$ $$\verb|Binominal vector| = q' \times q''.$$
In some other their are divided through the normal vector
$$\verb|Binominal vector| = \frac{q'}{\Vert q'\Vert} \times \frac{q''}{\Vert q''\Vert}.$$
I am not sure why some formularies are not dividing. In my opinion the formulary with $$\verb|vec_view| = \frac{q'}{\Vert q'\Vert}$$ is the right one, because I'll get a normalized vector.
Am I right ?