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S. L. Loney’s Plane Trigonometry (Part II) is a classical text for students of mathematics at class 12 and above. The book follows a concise yet exhaustive coverage of the advanced concepts of Trigonometry, following up from the author’s former volume which touched upon the basics of the subject. It deals with inverse trigonometry and other related topics, building upon the students’ knowledge for a higher course of study. This short book has stood the test of time, and has guided thousands of students towards a life in mathematics. The explanations are crisp, easy to understand and the examples demonstrate how the concepts work in practise, allowing students to spend less time in learning mere formulae and more time in understanding them. The questions cover a variety of difficulty levels and have been selected to form the basis for many question paper setting guidelines. Instead of regular books where the books gather questions from various papers, this book is where question papers get their questions from. It is a must-have for any and all mathematicians, novice or accomplished, if only to understand the pure genius of Professor Loney’s teaching methods. About S. L. Loney Sidney Luxton Loney was an English academician and the Professor of Mathematics at the Royal Holloway College, University of London. A fellow of Sidney Sussex College, Cambridge, Loney authored a set of mathematics and physics texts which have gone on to become the definitive texts in the subjects. Primary among these are: The Elements of Coordinate Geometry (Parts 1 and 2), Plane Trigonometry, (Parts 1 and 2) and The Elements of Statics and Dynamics (Parts 1 and 2). A graduate of Maidstone Grammar College and Sidney Sussex College, Prof. Loney is considered to be an early influence on the eminent mathematician Srinivasa Ramanujan.