How to simplify an expression using even odd and cofunction trig identities

The video tutorial explains how to simplify complex trigonometric expressions using even, odd, and cofunction identities. The instructor demonstrates the process step-by-step, emphasizing the importance of clarity and organization in mathematical work. The tutorial concludes with a simplified expression and encourages students to apply these techniques to similar problems.

Describe how to apply cofunction identities in trigonometric simplifications.

What is the significance of using parentheses in trigonometric expressions?