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Plane Trigonometry Part – 1 is a comprehensive book for students pursuing advanced courses in mathematics. The book comprises of chapters on trigonometrical ratios, applications of algebraic signs to trigonometry, identities and trigonometrical equations, and logarithms. In addition, the book consists of several solved and unsolved questions for thorough practice and revision. This book is essential for students preparing for competitive exams like AIEEE, NTSE, IIT-JEE, and mathematics Olympiad. About S. L. Loney Sidney Luxton Loney was a Professor of mathematics at the Royal Holloway College in Surrey. He was also a fellow of Sidney Sussex College. He has authored several books including, A treatise on elementary dynamics Mechanics and hydrostatics for beginners, An elementary treatise on statics, and The elements of coordinate geometry.