Pre-Calculus - Use The Double Angle Formula for Tangent to Evaluate for an Angle

The video tutorial explains the properties of angle U, which lies between π/2 and π, placing it in the second quadrant. It covers the cosine of angle U, emphasizing the relationship between adjacent and hypotenuse sides. The tutorial then focuses on solving for the tangent of 2U, using the Pythagorean theorem to find the opposite side. Finally, it demonstrates the algebraic process to calculate the tangent of 2U, resulting in a final answer of 4√5.

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