Learn how to evaluate the angle in radians for cosine

The video tutorial explains how to determine the cosine of an angle based on its position in a circle, specifically focusing on angles in the second quadrant where cosine is negative. It demonstrates the application of a formula involving cosine of U/2, reducing expressions, and simplifying results using the distributive property. The tutorial also compares the current problem with previous ones to highlight differences and similarities in approach.

Discuss the differences between the two problems mentioned in the text.

What is the result of applying the distributive property in this context?