Solving for cosine by factoring

The video tutorial reviews solving trigonometric equations, focusing on finding all solutions rather than just those in the first quadrant. It explains the importance of not dividing by variables, using the zero product property, and determining cosine values using the unit circle. The tutorial also covers the graph of the cosine function and how to write all solutions for trigonometric equations, emphasizing the periodic nature of trigonometric functions.

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