I found that I didn’t understand the Fourier transform very well, and I’m weak on my complex number algebra, so I wrote a tutorial explaining the Fourier transform using cos and sin rather than the traditional e^ix notation

I found that I didn't understand the Fourier transform very well, and I'm weak on my complex number algebra, so I wrote a tutorial explaining the Fourier transform using cos and sin rather than the traditional e^ix notation:

http://matthew-brett.github.io/teaching/fourier_no_ei.html

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