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  1. Aug 2021
    1. In general, when a closed interval [a,b][a,b][a, b]is mapped to an arc on the unit circle, the point corresponding to t=at=at = a is called the initial point of the arc, and the point corresponding to t=at=at = a is called the terminal point of the arc.

      This doesn't make sense. How can t=a be both the start and the end of an arc.

      Then, also confusing, the picture below shows an equation with x and y.