Evaluating for sine using the half angle formula

The video tutorial explains how to find the sine of 105 degrees using the half angle formula. It begins by discussing the limitations of using the unit circle and sum and difference formulas for this angle. The instructor introduces the half angle formula and demonstrates its application to solve for sine of 105 degrees. The process involves algebraic simplification and understanding the properties of trigonometric functions in different quadrants. The tutorial concludes with the final simplified expression for the sine of 105 degrees.

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