1. The problem statement, all variables and given/known data SO I'm given a dirac delta function, also known as a unit impulse function. d(t-t'_=(1/P) sum of e^[in(t-t')], for n from negative to positive infinity. I need to graph this. 2. Relevant equations I understand that at t', there is a force made upon the system which results in an impulse function. I need to convert the e^[in(t-t')] to get rid of the imaginary component. For this, Eulers equation is e^(it)=cost+isint 3. The attempt at a solution So just working with the inside of the summation, e^[in(t-t')]=cos[n(t-t')]+isin[n(t-t')]. But this is treating (t-t') as the independent variable when t is the independent variable. So I'm really not sure if this is right. Any help is greatly appreciated. Thanks.