Solid of revolution between two functions (leading up to the washer method)

MathxMatrix on Instagram: "The Euler–Lagrange equation is a cornerstone of classical mechanics and the calculus of variations. It tells us how to find the path or trajectory that a system will naturally follow—based on minimizing or extremizing a quantity called the action. This equation essentially replaces Newton’s laws in a more elegant, generalized form. Instead of forces, it uses energy principles to derive motion. Original creation by #Physwithelliot on Yt. #eulerlagrange #euler #quantum #