College Trigonometry (40 Lessons) covers the following topics: Review of Functions; Review of Geometry; Right Triangle Trigonometry; Angles of Elevation and Depression; Bearing; Linear Interpolation; Trigonometric Functional Value of any Angle; Trigonometric Functional Values of Quadrantal Angles; Trigonometry of Oblique Triangles; Laws of Sines and Cosines; Applications of Trigonometry to Vectors; Representation of Vectors; Addition (Sum, Resultant, or Composition) of Vectors; Trigonometry of Real Numbers; Radian Measure; Arc Length; Reference Number; Trigonometric Functional Values of Angles and of Real Numbers; Graphs of Trigonometric Functions; Periodicity of Trigonometric Functions; Inverse Trigonometric Functions; Operations Involving Inverse Trigonometric Functions; Graphs of Inverse Trigonometric Functions; Trigonometric Identities and Proving Trigonometric Identities; Solutions of Trigonometric Equations; and Measurements. Extra topics cover complex numbers and polar coordinate system.