How to apply constraints for trig problems

The video tutorial discusses constraints in relation to the unit circle and coordinate points in quadrants. It explains how to apply constraints to triangles and understand the roles of sine and cosine in different quadrants. The tutorial emphasizes the importance of knowing the signs of coordinates in each quadrant and how these relate to constraints.

What constraints must be satisfied for both sine and cosine to be positive?

How do you determine the quadrant based on the signs of sine and cosine?