## Essentials of trigonometry |

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### Contents

The treatment of vectors has been expanded to include some algebra | 1 |

A new section has been added on graphing equations in polar | 9 |

1 Right Triangles | 41 |

Copyright | |

11 other sections not shown

### Common terms and phrases

acute angle amplitude angular velocity Arccos Arcsec Arcsin calculator called Cartesian coordinate system centimeters circle circular functions complex number coordinates cos(a cos(x cos2 cosine function cot2 csc2 Definition 1.3 difference formulas direction angle domain elements equivalent exact value Example Find EXERCISE SET Find an approximation Find the exact function defined geometric vector given Hence identity initial point interval inverse function inverse notation Law of Cosines Law of Sines least nonnegative angle left-hand member linear velocity meters multiples negative nth root obtain ordered pairs Pythagorean theorem radian measure radius real numbers reference angle right triangle right-hand member sec2 shown in Figure sin(a sin(x sin2 sine and cosine sine function Sketch the graph Solution From Equation solution set specified standard position Substituting Table tan2 tangent terminal side trig trigonometric function values trigonometric ratios variable Write each expression x-axis zero