Finding the exact value for sine of 15 degrees using the half angle formula

The video tutorial covers the use of sum, difference, and half-angle formulas in trigonometry. It explains how to determine the sign of sine based on the quadrant and solve for angles using these formulas. The tutorial concludes with a detailed calculation to find the exact answer, emphasizing the application of radicals and the unit circle.

What is the cosine of 30 degrees and how is it related to the unit circle?

Describe the process of simplifying the expression involving square roots as mentioned in the text.