Synopsis This book on "Trigonometry" has been written to meet the requirements of B.A., B.Sc., and honours students of all Indian Universities. The book is also useful for competitive examinations. Attempt has been made to make the subject easy and understandable to the average students without sacrificing any rigor. Expansion f the Fundamental Principles is made clear and concise. At the same time the treatment is rigorous and up-to-date. T he language of the book is simple and easily understandable. The book contains a large number of fully solved examples, and care has been taken to include all varieties of questions. The questions are selected from the past examination papers of various Indian Universities. So that the students may the familiar with the types of questions which are usually set at the examinations.