Over the years, the text has been shaped and adapted to meet the changing needs of both students and educators. As always, special care was taken to respond to the specific suggestions of users and reviewers through enhanced discussions, new and updated examples and exercises, helpful features, and an extensive package of supplements and study aids. The result is an easy-to-use, comprehensive text that is the best edition yet.

1. The Trigonometric Functions. Angles. Angle Relationships and Similar Triangles. Trigonometric Functions. Using the Definitions of the Trigonometric Functions.

2. Acute Angles and Right Triangles. Trigonometric Functions of Acute Angles. Trigonometric Functions of Non-Acute Angles. Finding Trigonometric Function Values Using a Calculator. Solving Right Triangles. Further Applications of Right Triangles.

3. Radian Measure and the Circular Functions. Radian Measure. Applications of Radian Measure. The Unit Circle and Circular Functions. Linear and Angular Speed.

4. Graphs of the Circular Functions. Graphs of the Sine and Cosine Functions. Translations of the Graphs of the Sine and Cosine Functions. Graphs of the Tangent and Cotangent Functions. Graphs of the Secant and Cosecant Functions. Harmonic Motion.

5. Trigonometric Identities. Fundamental Identities. Verifying Trigonometric Identities. Sum and Difference Identities for Cosine. Sum and Difference Identities for Sine and Tangent. Double-Angle Identities. Half-Angle Identities.

6. InverseCircular Functions and Trigonometric Equations. InverseCircular Functions. Trigonometric Equations I. Trigonometric Equations II. Equations Involving Inverse Trigonometric Functions.

7. Applications of Trigonometry and Vectors. Oblique Triangles and the Law of Sines.