How to evaluate the half angle for cosine using a triangle

The video tutorial guides students through solving a trigonometric problem involving cosine and theta. It covers simplifying fractions using the distributive property, applying square root properties, and breaking down complex expressions. The instructor emphasizes the importance of understanding each step and provides multiple ways to simplify expressions, ensuring students grasp the concepts thoroughly.

Describe the process of distributing the square root across addition and subtraction.

How can you rewrite the expression involving sqrt(4) in the denominator?