I am getting an and bn in terms of t even though it is an integration with limits???

for i = 1:N

for k= 2:length(flim)

an= (2/T)*int((f(k-1))*cos(N*w0*t)),t,flim(k-1),flim(k);

an(i)=an;

bn= (2/T)*int((f(k-1))*sin(N*w0*t)),t,flim(k-1),flim(k);

bn(i)=bn;

fs= (a0/2)+(an*cos(w0*N*t))+(bn*sin(w0*N*t));

end

end

an

bn

fs