Proving Curvature Formulas: V X A / l V3l and a(t) * N(t) / l V(t) I2

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Homework Statement


I have to prove two of the curvature formulas. The first one is (V X A) / l V3l

The other one is a(t) * N(t) / l V(t) I2


Homework Equations



I have a hint from my professor, but it is all confusing. I need a youtube video or something to get started on these.

The Attempt at a Solution



I used the a(t) = at *T + an*N to get the first part, but now I am stuck on the making it into the form of V X A. The I have no idea how I would get it over the cube of the speed.
 
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These don't seem to be equations. There are no equals signs. Can you edit and tell us what you mean?
 

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