Solving a trigonometric equation with an undefined answer of cosine

The video tutorial explains how to solve quadratic equations by factoring and applying the zero product property. It introduces the concept of the unit circle in trigonometry, emphasizing the importance of understanding its constraints, such as the maximum distance of 1. The tutorial also discusses the domain and range limitations in trigonometry, particularly when finding solutions for cosine values. The instructor highlights the importance of knowing key points on the unit circle and demonstrates how to find solutions for cosine equations using these points.

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