I know how to obtain the unit tangent, it is very easy. But for the case of unit normal, I am confused.(adsbygoogle = window.adsbygoogle || []).push({});

Usually we need to know [itex]\vec{T'}(t)[/itex] and |[itex]\vec{T'}(t)[/itex]|

in order the find [itex]\vec{N}(t)[/itex].

However are there any quicker method to do it? Since I saw the textbook do it without step, it seems there is a quicker method.

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# A silly question about unit tangent and unit normal

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