Learn how to evaluate the composition of a function and inverse function

The video tutorial explains how to determine the angle that gives a cosine of 1/2, focusing on the first quadrant where cosine is positive. It then calculates the sine of 2 times pi over 3, identifying its position in the second quadrant and analyzing the coordinate points, emphasizing the negative x-coordinate and the positive y-coordinate for sine.

What is the sine value of 2 pi over 3?

What does sine represent in terms of coordinates?