## Precalculus: With Unit Circle TrigonometryDavid Cohen's PRECALCULUS, WITH UNIT-CIRCLE TRIGONOMETRY, Fourth Edition, focuses on teaching mathematics, 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. Important Notice: Media content referenced within the product description or the product text may not be available in the ebook version. |

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### Contents

Fundamentals | 1 |

Equations and Inequalities | 80 |

Functions | 129 |

Polynomial and Rational Functions Applications to Optimization | 213 |

Exponential and Logarithmic Functions | 325 |

The Trigonometric Functions | 423 |

Graphs of theTrigonometric Functions | 495 |

Analytical Trigonometry | 563 |

Systems of Equations | 729 |

The Conic Sections | 817 |

Roots of Polynomial Equations | 898 |

Additional Topics in Algebra | 973 |

A | 1 |

B | 8 |

Answers to Selected Exercises | 37 |

135 | |

### Common terms and phrases

algebra angle approximation asymptote axes axis box that follows calculator coefficients compute coordinates cos2 cosine curve decimal places defined definition denote determine distance domain ellipse equa estimate example exponential expression factor Find formula function f given equation graph ofy Graph the function graphing utility Hint hyperbola identity inequality input intersection interval inverse functions iterates last equation law of cosines law of sines length Let f(x line segment linear logarithms logb matrix multiply notation obtain parabola parametric equations polar population positive quadratic equation quadratic formula quadratic function radian radian measure radius rate of change rational roots theorem real numbers result Section shown in Figure side sin2 sine slope SOLUTION square symmetric tangent theorem tion trigonometric functions unit circle vector verify vertex vertical viewing rectangle x-axis x-coordinate x-intercepts y-axis yields zero