Learn how to take the derivative using the chain rule twice with cosine

The video tutorial explains the application of the chain rule in calculus, focusing on differentiating composite functions. It begins with an introduction to the chain rule, followed by identifying and differentiating parent functions. The tutorial then covers applying the chain rule to inner functions and combining derivatives of parent and child functions. Finally, it formulates the final derivative expression, emphasizing careful calculation to avoid errors.

How do you combine the derivatives of the parent and child functions?

What is the final expression for DY over DX as derived in the text?