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?

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

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