t1=(0:0.0001:0.5);
x1 = 1 - 2.*t1;


x5 = 0.25
for n = 1:5
x5 = x5 + [(2.*(1-cos(pi.*n)).*(1/(2.*(pi^2).*(n^2)))) - (2.*j/(2.*pi.*n))].*exp(j.*n.*2.*pi.*t1);
end

x50 = 0.25
for n = 1:50
x50 = x50 + [(2.*(1-cos(pi.*n)).*(1/(2.*(pi^2).*(n^2)))) - (2.*j/(2.*pi.*n))].*exp(j.*n.*2.*pi.*t1);
end

t2=(1:0.0001:1.5);

plot(t1,x1,t1,x5,t1,x50, t2,x1,t2,x,t2,x50)

axis([0 2 -1 2])

grid on