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A
frame is a local coordinate system that may change along a space curve.

The**t, n, **and
**b**
vectors are mutually orthogonal, kind of like the **x**, **y**, and**
z**
axes. However, unlike the **xyz**
axes, the** tnb**
frame changes along the space curve. The
**n** and** b**
vectors specify the plane orthogonal to **t**.

A TNB frame is also known as a*Frenet
frame*.

When**t**, **n**, **b** are
normalised and mutually orthogonal,
they are said to form an *orthonormal* basis
spanning 3D space.

The

A TNB frame is also known as a

When

High

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