Composition of cosine inverse and tangent

The video tutorial explains how to determine the cosine inverse of negative values, focusing on -1/2. It highlights the importance of understanding the unit circle and reference angles, specifically π/3 and 2π/3. The tutorial also covers calculating the tangent of 2π/3 and emphasizes the need for practice and showing work in quizzes.

How do you determine the tangent of an angle in the unit circle?

What is the simplified answer for the tangent of 2π/3?