Evaluate the half angle in radians for sine

The video tutorial explains the use of half angle formulas in trigonometry, focusing on determining whether the sine of an angle is positive or negative based on its quadrant. It guides through calculating the value of U from U/2 and simplifying the trigonometric formula, emphasizing the importance of understanding the signs and simplification techniques.

What is the cosine of 3π/4, and how does it affect the calculation of sine using the half angle formula?

Discuss the process of simplifying the expression involving the square root in the context of the half angle formula.