Simplifying a trigonometric expression by factoring

The video tutorial explains how to simplify mathematical expressions by substituting variables and factoring trinomials. It provides a step-by-step approach to simplifying expressions, including trigonometric functions, by replacing complex parts with simpler variables. The tutorial emphasizes the importance of factoring and substitution in solving problems efficiently. It concludes with a recap of the techniques discussed.

What is the significance of putting the final answer as a single quantity?

What should you do after factoring the expression and replacing X with cosine?