How to evaluate for cosine using the sum and difference identities

The video tutorial covers the selection of angles within the first quadrant for trigonometric calculations, focusing on the cosine of U-V formula. The instructor explains the importance of parentheses in the formula and demonstrates its application using specific angles. The tutorial also discusses simplifying trigonometric expressions and provides strategies for tackling multiple choice questions, emphasizing the need to understand different forms of answers.

Describe the importance of parentheses in the cosine formula as mentioned by the teacher.

What are the different ways the teacher mentions to write the answers in multiple choice questions?

What strategy does the teacher suggest for approaching multiple choice questions?