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Elementary trigonometry
Elementary trigonometry is a book written by mathematicians H. S. Hall and S. R. Knight. This book covers all the parts of Elementary Trigonometry which can conveniently be treated without the use of infinite series and imaginary quantities. The chapters have been subdivided into short sections, and the examples to illustrate each section have been very carefully selected and arranged, the earlier ones being easy enough for any reader to whom the subject is new, while the later ones, and the Miscellaneous Examples scattered throughout the book, will furnish sufficient practice for those who intend to pursue the subject further as part of a mathematical education.
Author(s): H. S. Hall and S. R. Knight
472 Pages 
Trigonometry Handbook by Earl L Whitney
This note covers functions and special angles, Graphs of trig functions, Inverse trigonometric functions, Key angle formulas, Trigonometric identities and equations, Solving an oblique triangle, Polar coordinates, Polar functions and vectors.
Author(s): Earl L Whitney
114 Pages
Trigonometry by Don Crossfield, Charlyn Shepherd, Robert Stein and Grace Williams
This book was written with those teachers and students in mind who are engaged in trigonometric ideas in courses ranging from geometry and second-year algebra to trigonometry and pre-calculus. The lessons contain historical and cultural context, as well as developing traditional concepts and skills.
Author(s): Don Crossfield, Charlyn Shepherd, Robert Stein and Grace Williams
192 Pages
Trigonometry by James D. Anderson
This book covers the following topics: Radian Angle Measurement, Definition of the Six Trigonometric Functions Using the Unit Circle ,Reference Angles, Coterminal Angles, Definition of the Six Trigonometric Functions Determined by a Point and a Line in the xy-Plane, Solving Right Triangles and Applications Involving Right Triangles, The Graphs of the Trigonometric Functions, The Inverse Trigonometric Functions, Solving Trigonometric Equations , Pythagorean and Basic Identities , Sum and Difference Formulas.
Author(s): James D. Anderson
NA Pages
This note explains the following topics: Foundations of Trigonometry, Angles and their Measure, The Unit Circle: Cosine and Sine, Trigonometric Identities, Graphs of the Trigonometric Functions, The Inverse Trigonometric Functions, Applications of Trigonometry, Applications of Sinusoids, The Law of Sines and cosines, Polar Form of Complex Numbers.
Author(s): Carl Stitz and Jeff Zeager
398 Pages