I love proving different things on mathematics, I mean, I love knowing where math theorems, methods and formulas come from. But most math books don't prove or show that kind of things. Do you know any book that could satisfy my wish? Obviously, there are lots of branches of mathematics, but I'm asking you to tell me, for example, "Oh, I know that X book proves all calculus theorems", "I've got a book called X that explains where all geometry formulas come from", etc.
Thank you