Consider the binormal vector B(t)=T(t)xN(t). Show that its derivative B'(t) is a scalar multiple of N(t).
So far I can prove that: B'=T'xN+TxN' B'=T'x(T'/|T'|)+TxN' B'=0+TxN' B'=TxN'
That doesn't prove the problem, any ideas?
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