Evaluate an expression by simplifying the sum and difference formulas

The video tutorial addresses the evaluation of trigonometric functions, specifically focusing on the sine of angles. Initially, there is confusion between sine and cosine notations, which is resolved by using parentheses for clarity. The teacher emphasizes evaluating angles without a calculator and guides students to identify the correct trigonometric formula. The session concludes with simplifying the problem to find the sine of 60 degrees.

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