There is probably not a single book that includes all the aspects of math. I am, however, looking for math books (by topic, such as trigonometry, number theory, etc.) that explain why certain things are the way they are. For example, if a book is talking about circles, it shouldn't expect me to accept that the angle of a circle is always 360 degrees, but explain me why it is so. No matter what the reason is (be it a convention, or some other reason), the book should state it. Are there such books? Thanks.
