Learn how to solve equation using double angle formula

The video tutorial explains how to solve a trigonometric equation involving cosine between 0 and 2π. It begins by introducing the problem and the need to use the double angle formula for cosine. The instructor then demonstrates how to rewrite the equation in terms of a single trigonometric function and factor it. Finally, the solutions are found using the unit circle, identifying the angles where cosine equals specific values.

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