1. The problem statement, all variables and given/known data Given the following periodic signal: What is the Fourier coefficient b1. I'm not asking for help with the Fourier series. I feel my integration is solid. What I need help with is creating the correct function! 3. The attempt at a solution I first declare t=5 as now to be t=0, and T=6 becomes t=2, etc. Am I allowed to do this? It also seems a bit iffy because the period starts at t=4... f(t) = 1, 0<t<1 t, 1<t<2 This gives me, as far as I can tell, the correct values for 0<t<2, compared to the graph. Unsure about the "t" function there... I am doubting whether this is correct, me and a friend have done the series 4-5 times now using this function, and we get the wrong answer, so we think the function we wrote is wrong. Can somebody help me make sense of this?