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A Semester Course in Trigonometry
This book has been written in a way that can be read by students. The chapters of this book are well suited for a one semester course in College Trigonometry. Topics covered includes: Equations and Inequalities, Geometry in the Cartesian System, Functions and Function Notation, Transformations of Graphs, Combining Functions, Inverse Functions, Angles and Arcs, Trigonometric Functions of Acute Angles, Trigonometric Functions of Any Angle, Trigonometric Functions of Real Numbers, Graphs of the Sine and Cosine Functions, Trigonometric Functions, Simple Harmonic Motion, Verifying Trigonometric Identities, Sum and Difference Identities, The Double-Angle and Half-Angle Identities, Conversion Identities, Inverse Trigonometric Functions and Trigonometric Equations.
Author(s): Marcel B. Finan
264 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
This note explains the following topics: Basic Trigonometry, Applications to complex numbers, Applications to complex Geometry, Application to Planar Geometry, 3D Geometry and Trigonometric Substitution.
Author(s): Naman and Freeman
84 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
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