Evaluate the sum of two angles with cosine

The video tutorial explains the cosine identity for the sum of two angles and demonstrates how to apply it to specific angles. It covers simplifying equivalent expressions using trigonometric identities and evaluates cosine and sine values using the unit circle. The tutorial also discusses rules for multiplying terms under radicals and how to combine and factor expressions for simplification.

How do you simplify the expression involving the square root terms in the context of trigonometric identities?

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Discuss the process of combining fractions with different denominators in trigonometric expressions.

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