This is part of the proof for curvature.
Prove V X A = k(ds/dt)3B
B is the the binormal vector. I have seen something in the proof with a T X N which I know is B.
I have already proven
a(t) = (d2s/dt2)T + K(ds/dt)2N
The Attempt at a Solution
I have seen some things where you start with v(t), and take the derivative then take a cross product, but I am not sure if this is how my professor wants us to do it. He wants us to use the a(t) part from above to prove it.