How to evaluate for the cosine of an angle using the half angle formula

The video tutorial explains how to determine the angle U within specific constraints, using a central angle in the 4th quadrant. It covers calculating the tangent and hypotenuse of a triangle, and finding the cosine of angle U. The process includes rationalizing the denominator to simplify the expression. The tutorial emphasizes understanding trigonometric relationships and applying them to solve problems.

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