Period as an aide with negative angles

The video tutorial explains how to simplify angle calculations by using periodic terms and coterminal angles. It demonstrates the process of evaluating the sine of angles by breaking them into simpler components using 2π. The tutorial also covers the concept of coterminal angles and how to use the unit circle to find coordinates. Finally, it reviews an older method of angle calculation, highlighting the efficiency of the new approach.

What does the teacher mean by 'canceling out' revolutions in the context of this problem?

Explain the process of evaluating -5π/4 using the unit circle.