Presents a thorough, no-frills introduction to trigonometry in the general context of functions and their graphs. Emphasizes the functional aspect of trigonometry including an introductory chapter on general ideas of functions and graphs. Covers exponential and logarithmic functions and the most important ideas from analytic geometry. Provides a large selection of exercises, half of them answered, ranging in difficulty from simple, straightforward checks on basic concepts, to problems that integrate several ideas and may involve applications. Features cumulative review exercises that cover groups of chapters.