Evaluate the half angle of sine using a right triangle

The video tutorial covers the creation of a triangle using a specific formula, understanding the concept of Theta and half angles, calculating the cosine of Theta, and simplifying and rationalizing mathematical expressions. It also discusses how to format answers for multiple choice questions, providing a comprehensive guide to solving trigonometric problems.

How does the distributive property apply to the expression mentioned in the text?

What could be a possible multiple choice answer format for the final expression derived in the text?