As per title thread. I'm looking for a good book/textbook that basically explains where and how mathematical formulas (those used in 2 - 4 unit NSW mathematics, both the simple formulas and complex ones) are derived from scratch and proves them. If one such godly book does exist, please put the name up here and a brief description. Thanks.
PS. Sorry if this is in the wrong forum/thread.
PS. Sorry if this is in the wrong forum/thread.