Precalculus Self-teaching Manual

Basically, or rather entirely, calculus is about functions. We do all kinds of cooking functions doing calculus.So this book is about functions, and covers basic functions, which include composite, inverse, and periodic functions, together with ordinary ones, contains lots of examples in such, and helps get used to such functions.This is in fact, a book of examples, so ideas or rules as formulas, identities, etc., or laws or principles are explained through examples.Each example is fully worked out and detailed, together with a summary at each end.So this book helps develop and grow manipulation and calculation technics on functions of many kinds, which are basic, and thus, essential and crucial. So this book will help strengthen problem-solving skill.