[Thầy Chí 2k9] TIẾT 1 Tìm khoảng Đồng biến, Nghịch biến

This video explains the concept of increasing and decreasing functions in mathematics. The instructor uses a chalkboard to illustrate definitions and examples related to calculus, specifically focusing on how the derivative of a function relates to its monotonicity. The lesson covers the mathematical definitions of increasing and decreasing functions and their application in analyzing function behavior.