Master Evaluating Sine and Cosine using Sum and Difference formulas

The video tutorial explains how to evaluate angles using sum and difference formulas. It covers the limitations of using a calculator for non-standard angles and demonstrates how to find exact values using known angles. The tutorial includes examples for sine and cosine calculations, emphasizing the importance of understanding the unit circle and applying the correct formulas.

Explain how to simplify the expression involving square roots when evaluating trigonometric functions.

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How do you apply the sum formula for sine to find the sine of 105 degrees?

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What is the cosine of the sum of two angles formula?

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What steps would you take to evaluate the cosine of 2π/3?

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