1. The problem statement, all variables and given/known data 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. 2. Relevant equations I have already proven a(t) = (d2s/dt2)T + K(ds/dt)2N 3. 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.