Chapter 10.3, Problem 16E

In Problems 9-16, compute the Fourier series for the given function f on the specified interval. Use computer or graphing calculator to plot s few partial sums of the Fourier series.

$f\left(x\right)=\{\begin{array}{l}0,-\pi <x<-\pi /2,\\ -1,-\pi /2<x<0,\\ 1,0<x<\pi /2,\\ 0,\pi /2<x<\pi \end{array}$