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.