I used to be smart... Uses of trigonometry via Wikipedia has demonstrated just how much I have forgotten.
I have used things such as Fourier series and Fourier transform 16 years ago in college. Could I reacquint myself with the ideas? Maybe, but I am not confident.
Check out this page on Fourier transform. Now when I see things like this I think "huh?". The Tim of 1988 was a completely different person.
Lately I have needed to use the calculator in Windows to simply add numbers together.
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