## TrigonometryDesigned for the one-term course in trigonometry, the Third Edition incorporates all of the many teaching and learning tools that have made Zill's texts a resounding success. A rich pedagogy and an extensive supplements package make this text a must-have resource for students and instructors alike. Zill takes care to include a full set of engaging and motivating features for students, including a wide range of word problems and specific applications, historical accounts of mathematicians, and a strong variety of relevant exercises. These extensive exercises give students the opportunity to test their comprehension, challenge their understanding, and apply their knowledge to real-world situations. |

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### Contents

1 Prerequisites for Trigonometry | 1 |

2 Right Triangle Trigonometry | 89 |

3 Unit Circle Trigonometry | 123 |

4 Applications of Trigonometry | 179 |

5 Complex Numbers and Vectors | 205 |

6 Exponential and Logarithmic Functions | 239 |

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### Common terms and phrases

acute angle amplitude Answers to selected calculator complex number conic cosine functions cosu cosx cotu curve defined directrix distance domain dot product ellipse endpoints EXAMPLE Exercises Answers exponential Express Find an equation foci focus formula function f given function Graph for Problem hyperbola inequality integer interval inverse Law of Cosines Law of Sines length limaçon line segment linear logarithmic measured minor axis number line obtain odd function odd-numbered problems begin one-to-one function orbit origin parabola parametric equations plane Polar axis polar coordinates polar equation positive quadrant quadratic function radians radius real numbers reference angle right triangle rotation Section selected odd-numbered problems shown in FIGURE sine and cosine sinu sinx Solution solve standard form symmetric with respect symmetry tangent tanu tanx terminal side Theorem trigonometric functions unit circle vector velocity vertex x-axis x-coordinate x-intercepts y-axis π 2 π π π