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I really doubt you were exposed to partial differentials or maticies or a whole host of other stuff that kids now have to deal with at a high school level, it just was not done.
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I was...I also had to do calculus (of all types), algebra, full and partial differentiation, co-ordinate geometry, conic section, probs and stats, and quite a few other things I'd rather forget
As for such maths not being taught many years ago, I've seen my father's school books and some of his old textbooks from school. He was last in school in 1939. Everything you and I mentioned were in those books. He was a maths whiz...never got less than 98% for his exams. Some of the stuff he could work out in his head makes mine spin!!!!.