Derivative at a Point Demo

This example demonstrates the calculation and geometric meaning of the derivative at a point on a function's graph, showing the approximation process of secant lines approaching the tangent line. Key math concepts include derivative definition, secant line, tangent line, limit concept, and function properties. It uses commands like Point, Segment, Line, Textfield, and objects such as f (function), A (point), h (variable), B (point), g (function), j (variable), InputBox1 (input box), i (object), and text1 (text). Suitable for high school calculus education to understand the geometric meaning of derivatives and the limit process.