This question comes from my multivariable differential calculus course. I cannot figure how to prove that the following is true...(adsbygoogle = window.adsbygoogle || []).push({});

How does...

__r'(t) x r''(t) x r'(t)_ = N(t) ?

||r'(t) x r''(t) x r'(t)||

any help would be appreciated...thanks

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# Unit normal vector N(t)

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