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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?

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# Why do we need Fourier Transform?

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