Determine the integral:
∫ − T / 2 T / 2 e j 2 π ( n − m ) t / T d x T i f n = 0 = { 0 e l s e {\displaystyle \int _{-T/2}^{T/2}e^{j2\pi (n-m)t/T}\,dxTifn=0=\{0else}
