# *s(t)*=$\int_{t_0}^{t}\left | R'(\xi) \right | d\xi$ What is $\xi$ ?

$s(t)=\int_{t_0}^{t}\left | R'(\xi) \right | d\xi$
What is $\xi$ ?

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

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