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I think that the mathematical concepts that I learned were mostly generally useful.
But what was useless was the emphasis on doing work by hand. My particular pet peeve is all the time I spent in calculus classes being taught techniques to do symbolic integration by hand.
I was doing a math project once, working with the husband of one of my calculus professors. He himself was a mathematics professor. I dropped by his office. He had to work something out that involved a symbolic integration and fired up Mathematica. I said "You can probably do all this by hand". He laughed and said something like, "Nobody who has to do actual work with this is going to waste time doing this by hand". He was right.
Today, I use
maximato do symbolic integration. It's in my Linux distro and on my Android phone.