Same here. I was a math major back in the 90s. It was about proofs and learning logic, not memorization. Sure, you could memorize a list of formulas but it was much easier (and encouraged) to memorize one or two and know how to adapt them to what you needed.

Most of our tests were 'open book' because the book wasn't going to help you if you couldn't do logic.

I have no idea how much of that has changed with the 'math is rassis' attitude of today or even if they teach anything other than politics in schools.