"Ah, you've arrived," Stewart said with a warm smile. "This island is a realm of rates of change, accumulation, and optimization. To unlock its secrets, you must master the concepts within this book."
I opened the textbook to a dog-eared page, which revealed a familiar equation: dy/dx = f'(x) . Stewart nodded. "You see, my friend, the derivative represents the rate of change of a function. It's the foundation of calculus." James Stewart Calculus 10th Edition
Stewart beamed with pride. "Well done! You've demonstrated mastery over the calculus of optimization. The secrets of this island are now yours to wield." "Ah, you've arrived," Stewart said with a warm smile