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## Overview

David Cohen's PRECALCULUS: A PROBLEMS-ORIENTED APPROACH, Sixth Edition, focuses on teaching mathematics by using a graphical perspective throughout to provide a visual understanding of college algebra and trigonometry. The author is known for his clear writing style and the numerous quality exercises and applications he includes in his respected texts. In this new edition, graphs, visualization of data, and functions are now introduced much earlier and receive greater emphasis. Many sections now contain more examples and exercises involving applications and real-life data. While this edition takes the existence of the graphing calculator for granted, the material is arranged so that one can teach the course with as much or as little graphing utility work as he/she wishes. This Enhanced Edition includes instant access to Enhanced WebAssign®, the most widely-used and reliable homework system. Enhanced WebAssign® presents thousands of problems, links to relevant textbook sections, video examples, problem-specific tutorials, and more, that help students grasp the concepts needed to succeed in this course. As an added bonus, the Start Smart Guide has been bound into this text. This guide contains instructions to help students learn the basics of WebAssign quickly.

- This Enhanced Edition includes instant access to Enhanced WebAssign®, the most widely-used and reliable homework system. Enhanced WebAssign® presents thousands of problems, links to relevant textbook sections, video examples, problem-specific tutorials, and more, that help students grasp the concepts needed to succeed in this course. As an added bonus, the Start Smart Guide has been bound into this text. This guide contains instructions to help students learn the basics of WebAssign quickly.
- The role of the graphing utility has been expanded in this edition, with graphing utility material carefully integrated throughout the text. Graphing utility exercises are now integrated into the exercise sets with an icon to identify them. Reviewers praised Cohen's thoughtful approach to the optional use of technology, lauding his realistic use of modern technologies while maintaining a solid foundation in algebraic concepts.
- Exercises have been rewritten, updating real data and applications throughout.
- In addition to the "Writing Mathematics" sections, there are now "Projects" and "Mini Projects" at the ends of many sections. These give the students additional opportunities to discuss, explore, learn, and write mathematics.
- The material on long division of polynomials has been moved to Chapter 12, preceding synthetic division.
- Chapter 3 includes an expanded introduction to the function concept. Functions are introduced at length using algebraic, verbal, tabular, and graphical forms. Functions as models are introduced and used in examples and exercises. Implicit functions are introduced in the section PROJECT. Material on the average rate of change of a function (previously in section 3.2) has been expanded and there is an increased emphasis on applications.

- Coordinates and graphs are developed in Chapter 1.
- Iteration is covered from numerical, graphical, and algebraic viewpoints.
- The author has a remarkable writing style that is student friendly and yet mathematically honest.
- The "Graphical Perspective" feature uses graphs to supplement the text discussion and encourage students to produce their own pictures of a graph.
- There is a strong emphasis on graphs and visualization, with numerical, graphical, and algebraic viewpoints tightly linked throughout the text, to help students understand the material.

Sets of Real Numbers. Absolute Value. Solving Equations (Review and Preview). Rectangular Coordinates. Visualizing Data. Graphs and Graphing Utilities. Equations of Lines. Symmetry and Graphs. Circles.

2. EQUATIONS AND INEQUALITIES.

Quadratic Equations: Theory and Examples. Other Types of Equations. Inequalities. More on Inequalities.

3. FUNCTIONS.

The Definition of a Function. The Graph of a Function. Shapes of Graphs. Average Rate of Change. Techniques in Graphing. Methods of Combining Function. Iteration. Inverse Functions.

4. POLYNOMIAL AND RATIONAL FUNCTIONS.

Applications to Optimization. Linear Functions. Quadratic Functions. Using Iteration to Model Population Growth (Optional Section). Setting up Equations That Define Functions. Maximum and Minimum Problems. Polynomial Functions. Rational Functions.

5. EXPONENTIAL AND LOGARITHMIC FUNCTIONS.

Exponential Functions. The Exponential Function y = ex. Logarithmic Functions. Properties of Logarithms. Equations and Inequalities with Logs and Exponents. Compound Interest. Exponential Growth and Decay.

6. TRIGONOMETRIC FUNCTIONS OF ANGLES.

Trigonometric Functions of Acute Angles. Algebra and the Trigonometric Functions. Right-Triangle Applications. Trigonometric Functions of Angles. Trigonometric Identities.

7. TRIGONOMETRIC FUNCTIONS OF REAL NUMBERS.

Radian Measure. Radian Measure and Geometry. Trigonometric Functions of Real Numbers. Graphs of the Sine and the Cosine Functions. Graphs of y = A sin(Bx-C) and y = A cos(Bx – C). Simple Harmonic Motion. Graphs of the Tangent and the Reciprocal Functions.

8. ANALYTICAL TRIGONOMETRY.

The Addition Formulas. The Double-Angle Formulas. The Product-to-Sum and Sum-to-Product Formulas. Trigonometric Equations. The Inverse Trigonometric Functions.

9. ADDITIONAL TOPICS IN TRIGONOMETRY.

The Law of Sines and the Law of Cosines. Vectors in the Plane, a Geometric Approach. Vectors in the Plane, an Algebraic Approach. Parametric Equations. Introduction to Polar Coordinates. Curves in Polar Coordinates.

10. SYSTEMS OF EQUATIONS.

Systems of Two Linear Equations in Two Unknowns. Gaussian Elimination. Matrices. The Inverse of a Square Matrix. Determinants and Cramer''''s Rule. Nonlinear Systems of Equations. Systems of Inequalities.

11. ANALYTIC GEOMETRY.

The Basic Equations. The Parabola. Tangents to Parabolas (Optional). The Ellipse. The Hyperbola. The Focus-Directrix Property of Conics. The Conics in Polar Coordinates. Rotation of Axes.

12. ROOTS OF POLYNOMIAL EQUATIONS.

The Complex Number System. Division of Polynomials. Roots of Polynomial Equations: The Remainder Theorem and the Factor Theorem. The Fundamental Theorem of Algebra. Rational and Irrational Roots. Conjugate Roots and Descartes'''' Rule of Signs. Introduction to Partial Fractions. More About Partial Fractions.

13. ADDITIONAL TOPICS.

Mathematical Induction. The Binomial Theorem. Introduction to Sequences and Series. Arithmetic Sequences and Series. Geometric Sequences and Series. DeMoivre''''s Theorem.

Appendix 1: Using a Graphing Utility.

Appendix 2: Significant Digits and Calculators.

Tables.

Answers to Selected Exercises.

Index.

Cengage provides a range of supplements that are updated in coordination with the main title selection. For more information about these supplements, contact your Learning Consultant.

### FOR INSTRUCTORS

#### Precalculus, 7th: Complete Solutions Manual

ISBN: 9781111428846

This manual contains fully worked-out solutions to all exercises in the text.

#### Precalculus, 7th: DVD Program

ISBN: 9781111428853

These DVDs cover all sections in the text. Ideal for promoting individual study and review, these comprehensive video segments also support students in online courses or those who may have missed a lecture.

#### Test Bank

ISBN: 9781111428839

The Test Bank contains multiple test forms for each chapter in the book, as well as final exams.

#### Student Solutions Manual

ISBN: 9781111428242

Contains fully worked-out solutions to all of the odd-numbered exercises in the text, giving students a way to check their answers and ensure that they took the correct steps to arrive at an answer.

### FOR STUDENTS

#### Student Solutions Manual

ISBN: 9781111428242