This is just a sample of a series of books i am developing. When you leave feedback please email me as when i have completed the books i intend to give out a lot of free copies to my mailing list.Will Pythagoras always work ? Where does calculus come from ? What's the point of trigonometry ? Why does that work ? Where does that come from ? These are questions that may have considered but as teachers and tutors are often stretched and short of time don't have time to explain them to you. Students are often taught how to follow the steps to solve the problem. Here is a sample of a larger book. This book goes beyond current teaching and endevours to give you a deeper understanding of particular subject areas of mathematics. Where does a particular formula come from, explaining calculus.