Most calculus books in India never have any information on the history of calculus.
I remember being taught limits, differentials, etc purely as mathematical structures.
No context what-so-ever.
In engineer, I read a book called "Advanced Engineering Mathematics" by Erwin Kreyszig. This was a wonderful book that also had some footnote references to calculus books.
It was pulling on that thread and reading quite a bit of history and other good books (MIT Books) that I got a hand of the inside out of calculus.
How I passed Calculus exams in High school, only god knows.
I am an engineer now and will be ever grateful to the likes of George B Thomas, James Stewart, N Piskunov for teaching me calculus and making me wonder why such a beautiful concept was twisted and mangled by official curriculum books in India.