The Fourier Series is a free Android application developed by Ivan Petuhov. It falls under the category of Education & Reference and is an excellent tool for expanding functions in Fourier series at an interval of x. The program offers a variety of options and arguments, including x, y, n, a, b, c, and more.

The Fourier Series calculator supports all math symbols and functions, such as sin(x), cos(x), exp(x), tan(x), ctan(x), sqrt(x), and others. It also supports complex variables, making it a versatile tool for math enthusiasts. The program provides a graph of the function and several nearly Fourier series, allowing you to see the results of the expand on the graph.

The calculator contains several features, including several examples and correct input expression errors. It is an excellent tool for students, teachers, and anyone who needs to use Fourier series in their calculations. Overall, The Fourier Series is a powerful calculator that delivers accurate results and is easy to use.