How to evaluate the half angle for sine in radians

The video tutorial explains how to evaluate the sine of π/2 by identifying the angle's location in the first quadrant, where sine is positive. It introduces a formula involving sine and cosine, and demonstrates solving for U. The tutorial simplifies the expression using radicals and reviews algebra concepts, providing insights into common answer formats.

What is the cosine of π/6 and how does it relate to the expression being simplified?

Discuss the process of simplifying the expression under the radical as mentioned in the text.