This program will graph the first 20 Fourier polynomials of y = f(x), after you enter f(x) and the period 2L. You can also enter the Fourier coefficients a(n) and b(n) (fast and accurate), or have the computer perform numerical integration to evaluate them (slow and approximate). The program also lets the user create even and odd functions.

This is a part of the Mathematics Toolkits Software developed at the University of Arizona.