Solving an equation with cosine of a multiple angle

The video tutorial explains how to solve a cosine equation involving a multiple angle, specifically 3T. It emphasizes the importance of inverse operations and common mistakes students make, such as dividing by three prematurely. The tutorial guides through isolating the cosine function, finding the values of cosine at 1/2, and determining the angles. It concludes with finalizing the solution by dividing by three and explaining the concept of infinite solutions.

How do you express the general solution for T after finding the values of cosine?

What is the significance of adding 2πN in the solutions for T?