Solving a trigonometric equation with cosine equal to negative one

The video tutorial explains how to evaluate the cosine of an angle when it equals -1. It begins by discussing the unit circle and identifying the X coordinate where the angle intersects. The tutorial then determines the angle between 0 and 2π, which is π, and explains how to find all solutions without constraints, resulting in π plus 2πR, where R is a variable representing the number of rotations. The video concludes with a summary of the solution process.

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