Half angle formula cosine

The video tutorial explains how to evaluate the half angle formula by plugging in values and simplifying complex fractions. It covers determining the sign of the angle, simplifying fractions by finding a common denominator, and performing calculations to arrive at the final result.

What is the half angle formula being evaluated in the text?

Explain the significance of determining the positive and negative values in the context of the half angle formula.

What steps are taken to eliminate the fractions in the calculations?

How is the common denominator determined in the context of the fractions mentioned?

What is the final answer derived from the calculations, and how is it expressed?