**Part 3 - Applications of Derivatives - Video 9**

Section 3: Optimization Problems

*Lesson 2: Rectangle Trapped Under Curve (38:17)*

A new example involving a rectangle inscribed (trapped) under a curve, working Step 1 (label variables and constants) *(0:37)*, Step 2 (identify the function to maximize or minimize) *(7:21)*, and Step 3 (find constraint equation) *(13:11)*.