1. The document contains formulas and definitions related to trigonometry, including definitions of trigonometric functions, identities, right triangles, laws of sines and cosines for oblique triangles, trigonometric functions of vectors, and hyperbolic trigonometry. 2. Key concepts covered include definitions of trigonometric functions, complementary and supplementary angles, trigonometric ratios in right triangles, trigonometric identities, laws of sines and cosines, vector dot and cross products, and hyperbolic trigonometric functions. 3. The document provides over 75 formulas and definitions in both text and mathematical notation to comprehensively cover topics in plane and vector trigonometry.