Solve an equation with double angle of cosine

The video tutorial covers the concept of cosine and Theta, explaining the difference between cosine of Theta and cosine times Theta. It discusses the challenges of combining trigonometric functions with different arguments and introduces the double angle formulas for cosine. The tutorial also covers factoring trinomials by substituting cosine of Theta with X, and solving equations using the zero product property. The importance of understanding the unit circle is emphasized for solving trigonometric equations.

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