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Trigonometry Notes by Brooke Quinlan
This note covers the following topics: Angles and Their Measure, Right Triangle Trigonometry , Computing the Values of Trigonometric Functions of Acute Angles, Trigonometric Functions of General Angles, Graphs of the Sine and Cosine Functions, Graphs of the Tangent, Cotangent, Secant, and Cosecant Functions, Phase Shifts, The Inverse Trigonometric Functions, Trigonometric Identities, Sum and Difference Formulas, Double-angle and Half-angle Formulas, Trigonometric Equation, Applications Involving Right Triangle, Area of a Triangle.
Author(s): Brooke Quinlan
125 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 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
Notes for Trigonometry by Dr. Randall Paul
This note describes the following topics: Angles, Trigonometric Functions, Acute Angles, Graphs of Sine and Cosine, Trigonometric Equations, Formulas, Complex Numbers, Trigonometric Geometry, Law of Sines and Cosines.
Author(s): Dr. Randall Paul
145 Pages