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## Main Question or Discussion Point

[itex]s(t)=\int_{t_0}^{t}\left | R'(\xi) \right | d\xi[/itex]

What is [itex]\xi[/itex] ?

In the above arc length formula with ##\xi##, what is ##\xi##?

What is [itex]\xi[/itex] ?

In the above arc length formula with ##\xi##, what is ##\xi##?

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