Evaluating the half angle for cosine 15 degrees

The video tutorial explains how to evaluate angles using sum, difference, and half-angle formulas, focusing on the example of 15 degrees. It highlights the common mistakes students make, such as incorrectly substituting angles in the half-angle formula. The tutorial also covers techniques for simplifying fractions in trigonometric calculations, providing a step-by-step approach to solving these problems. The final section concludes with the correct calculation and interpretation of the results.

Describe how to simplify the expression involving square roots in the evaluation of cosine.

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What is the final expression for cosine of 15 degrees after applying the half angle formula?

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