Drill problems and application exercises have been added or modified to encourage exploration and ver-balization of mathematical concepts, results, and processes, similar to the Explore-Discuss boxes.

Chapter 2 on trigonometric functions has been reorganized and streamlined. 

The unit circle approach now appears earlier in the chapter in Section 2.3. 

A section on graph transformations--shifts, reflections, stretches, and shrinks--has been added to Appen-dix B. 

The C level exercises have been expanded to include more problems that involve critical thinking. 

New applications involving real data have been added where appropriate. 

Optional applications involving graphing utilities and regression have been added for those who wish to cover this method of curve fitting.

Additional examples were added where requested by reviewers.