Evaluate cosine of an angle using the difference of two angles formula

The video tutorial explains how to rewrite angles as sums or differences, focusing on cosine. It covers reducing angles, labeling them as U and V, and applying the cosine difference formula. The instructor emphasizes the importance of evaluating trigonometric values accurately and demonstrates simplifying and factoring results. The tutorial also highlights the need to be cautious when switching between radians and degrees.

What new insight or understanding did you gain from this video?