Definition of Derivative by David Hornbeck

This example demonstrates the geometric meaning of the derivative by dynamically showing the intersection of secant and tangent lines, revealing the essence of the derivative. Core mathematical concepts include derivative, secant, tangent, function graph, and limit. Construction highlights involve GeoGebra commands like Intersect (intersection calculation) and Line (line drawing), with objects such as functions f, g, h, i, points A, B, j, text boxes text1, text2, k, text3, l, m, text6. Suitable for high school and above students learning calculus, or for teacher demonstrations.