Chapter 23: Trigonometry Last updated Dec 25, 2024 Save as PDF 22.9: Indirect Proofs - Contradiction 23.1: Angles in the Coordinate Plane Page ID174412 ( \newcommand{\kernel}{\mathrm{null}\,}\) 23.1: Angles in the Coordinate Plane23.2: Trigonometric Functions - Coordinate Definition23.3: Evaluating Trigonometric Functions at Special Angles23.4: Evaluating Trigonometric Functions Using Technology23.5: Trigonometric Identities - The Ratio, Reciprocal, Symmetry, and Cofunction Identities23.6: Trigonometric Identities - The Pythagorean Identities23.7: Proving Trigonometric Identities23.8: Trigonometric Functions - Right Triangle Definition23.9: Solving Right Triangles23.10: Applications Involving Right Triangle Trigonometry23.11: Reference Angles23.12: Radian Measure and Arc Length23.13: Trigonometric Functions - Unit Circle Definition23.14: Sector Area23.15: Linear and Angular Velocity23.16: Base Graphs of the Trigonometric Functions23.17: Non-Rigid Transformations23.18: Rigid Transformations23.19: Sinusoidal Models23.20: Harmonic Motion23.21: Damped Harmonic Motion23.22: Trigonometric Identities - Sum and Difference of Angles Identities23.23: Trigonometric Identities - Double-Angle Identities23.24: Trigonometric Identities - Half-Angle and Power Reduction Identities23.25: Trigonometric Identities - Sum-to-Product and Product-to-Sum Identities23.26: The Inverse Trigonometric Functions23.27: Graphs of the Inverse Trigonometric Functions23.28: Solving Simple Trigonometric Equations23.29: Solving Trigonometric Equations Involving Multiple Angles23.30: Solving Trigonometric Equations Using Identities23.31: Law of Sines23.32: Law of Cosines23.33: Areas and Heron's Formula