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6) A Fourier Series is a series that represents a periodic function as a sum of sinusoids. Here we will consider the Fourier Series for a square wave that has a period of length 2L. This series is an infinite series, but reasonable approximations to the square wave can be obtained using only a small number of terms. The equation for the series is: 00 NTEX f(x) -sin 72 n=1,3,5.... (*) TE Write a function called A4 fourier.m to evaluate this series. Your function should have the following form: function [xvals, yvals) - A4 fourier (L, nmax, numpoints) 8 your code here end where the variables are defined as follows: L a number representing the half period of the square wave nmax the upper limit of the summation. n = 1,3,5,.. nmax rumpoints the number of x-values to evaluate xvals the set of x values (an array) yvals the set of f(x) values (an array)