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Dave's Short Trigonometry Course
These notes are more of an introduction and guide than a full course. Topics covered includes: Applications of trigonometry, What is trigonometry?, Background on geometry, Angle measurement, Chords, Sines, Cosines, Tangents and slope, The trigonometry of right triangles, The trigonometric functions and their inverses, Computing trigonometric functions, The trigonometry of oblique triangles, Demonstrations of the laws of sines and cosines, Area of a triangle, Ptolemy’s sum and difference formulas and Summary of trigonometric formulas.
Author(s): David E. Joyce
NA 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