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Binormal Vector Sign Video

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Definition

Let N(t)=T'(t)/|T'(t))| be the principal unit normal vector (or simply unit normal). The vector B(t) = T(t) x N(t) is called the binormal vector. It is perpendicular to both T and N and is also a unit vector.

Source: Multivariable Calculus, 7th edition by James Stewart
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