Definition of a Derivative by rrrudd

This example demonstrates the definition of a derivative interactively. It visually shows the geometric meaning of the derivative by dynamically adjusting point A on the function f(x) and drawing the tangent line. Core mathematical concepts include function, derivative, tangent slope, and the concept of limits. Construction highlights the use of GeoGebra commands like Line for drawing tangents and segments, and Slope for calculating slopes, along with objects such as f, a, A, tl, h, B, b, m, mt, ms, text1, text2, c, text3. Suitable for high school and above students to understand the definition and geometric meaning of derivatives.