when doing $u$ substitution sometimes they use $du/dx$ but other times they use $dx/du$ in the book to get $du$ and I am just confused which one to use and when as they change the answer of $du$ and if I do it wrong can lead to mistakes.
2026-04-03 17:35:06.1775237706
what is the difference between du/dx and dx/du in u-substitution how do you know which one to use?
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