Variation of Cosine Function

The variation of the cosine function is an important concept in mathematics, describing the rules of change of the cosine function in different ranges. This example demonstrates the characteristic of the variation of the cosine function, involving core mathematical concepts such as trigonometry, cosine function, and geometry. The construction points include using GeoGebra commands to create the cosine function graph and using objects ω, A, φ, B, and p for operation. Suitable for middle school mathematics and high school mathematics teaching of geometry and trigonometry.