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เนื้อหาย่อ : Trigonometry is written as a college-level text to provide a basis for future work in mathematics and its applications. For students planning to take calculus, chemistry, engineering, or physics the material covered is essential. I have avoided a formal "theorem-proof" style of writing and have instead used a more conversational approach because I believe this makes the book more readable for students. Nevertheless, the book is mathematically sound, and certain proofs appropriate to the level of mathematical maturity of the users are given. Many worked-out examples are included, illustrating the main types of problems in the exercise sets. The exercise sets are divided into A and B problems, with the more challenging problems to be found in the B category. There are numerous drill-type problems in the A exercises designed to fix concepts and provide practice in the technique being studied. Each chapter is introduced by an example taken from a textbook in a field which employs trigonometry. The example illustrates an application of one or more of the concepts to be studied in the chapter. Students are not expected to follow the details of these introductory examples but simply to observe the application of trig- onometry. The examples thus serve as motivational devices, showing the student that what they will be studying has immediate application in an area they may well be pursuing. I have introduced numerical trigonometry before analytical trigonometry because I believe this provides greater motivation for students and is pedagogically the sounder approach. The trigonometric functions are introduced first in terms of right triangles, then for general angles, and finally as functions of real numbers. The solution of right triangles is taken up in Chapter 2, after which the analytical aspects of the subject are studied in Chapters 3 and 4. Chapters 5 and 6 on logarithms and the solution of oblique triangles could follow Chapter 2 if the instructor prefers this order. I have used the order given so as to avoid too great a delay in introducing analytical trigonometry. The concluding chapter on complex numbers brings out the beautiful relationships this subject provides between algebra, geometry, and trig- onometry. The advent of hand calculators and their widespread availability at moderate prices have had a dramatic impact on the computational aspects of many courses, and this is particularly true in trigonometry. Lengthy computations involving trig-