Demonstration of the Derivative of cos(x)

This example dynamically illustrates the slope of the tangent line at a point on the cosine function graph, visually presenting the derivative rule of cos(x). Key math concepts include derivatives, tangent slope, and cosine function graph characteristics. GeoGebra commands like Point, Tangent, and Slope are used, along with objects such as f (function), A (point), a (parameter), m (slope), D (dynamic object), text1 (text), and g (graph). Suitable for high school calculus education to help students understand the geometric meaning of derivatives and the derivative formula for cosine functions.