Geogebra is an open source application designed specifically for the learning and teaching of geometry, algebra, and calculus classes. The program
allows you to comfortably navigate an attractive online environment. You just have to select the figure you need and type in the parameters for the problem you're trying to solve. The application includes a dynamic calculus tool that can modify the representation of the graph in real time, as you change the values. This is a very useful tool for the academic setting, whether for students or for the demonstrations teachers use during class.
The application is capable of a huge number of operations, including simple geometric tasks like calculating angles or representing functions, derivatives, and integrals. Also, it allows you to export the results in the form of any graph, including SVG vector layers. This modularity is especially interesting when you realize that there are an infinite number of examples created by other users. They are available to everyone through the online catalogue of the official website.
GeoGebra is definitely an interesting option for students who want to improve their knowledge regarding this subject in the most convenient way possible. Tangent is one of the functions that GeoGebra is capable of.