Hi all. I am revisiting Fourier transform now and am wondering why we need Fourier transform? I mean, what's so special of representing a function in another way (in terms of sine waves)? Actually, I am now working on a problem. I was just told that someone worked out something in Fourier space and hence the results are steady state results. I have difficulty in understanding this. Why results in Fourier space implies steady state results? Can someone help me out please?