Given an expression determine the function and angle

The video tutorial emphasizes the importance of understanding formulas through practice rather than memorization. It explains how cosine and sine functions are paired and the differences in their formulas. The tutorial also demonstrates the application of the cosine formula to specific angles, highlighting the use of addition and subtraction in these calculations.

What values are assigned to U and V in the cosine formula discussed?

How do you evaluate the cosine of 45 degrees plus 120 degrees?