Gradient Vector to a Surface

This example demonstrates how to draw gradient vectors on a surface in 3D space. It involves core mathematical concepts such as gradient vector calculation, 3D surfaces, vector representation, and spatial geometric relationships. The construction uses GeoGebra commands and objects like Vector, and variables a, b, c, d, t, e, A, u. It is suitable for university students in mathematics, physics, or engineering to understand and visualize gradient vectors on surfaces and their properties.