## Calculus: Early Transcendentals (2nd Edition)

$\textbf{T}(t) = \frac{\textbf{r}'(t)}{|\textbf{r}'(t)|}$ Where $\textbf{T}(t)$ is a Unit Tangent Vector and $\textbf{r}'(t)$ is a Tangent Vector on an oriented curve: