## Essentials of trigonometry |

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### Contents

Area of a Sector | 55 |

Additional Trigonometric Identities | 100 |

Sunrise and Sunset and Linear Interpolation | 122 |

Copyright | |

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9 cos 9 9 sin 9 Algebraic angle 9 angles measured Arccos Arcsec Arcsin Arctan calculator called cardioid central angle Chapter circle cofunction complex numbers cos(a cos2 cosecant cot 9 cot2 cotangent degrees DISPLAY eight fundamental identities esc 9 esc2 Evaluate exact values Example exponential expressions in Problems formula four decimal places given in Problems Graph hypotenuse imaginary unit inverse functions inverse trigonometric functions Law of Cosines Law of Sines Let 9 nearest negative nth Root Objective period plane plotting points primary representations Problem Set Prove Pythagorean Theorem Quadrant radian measure radians radius real numbers reciprocal rectangular form reference angle right triangle roots rose curve rotation sample test sec 9 sec2 secant shown in Figure significant digits similar triangles simplify sin(a sin2 Solution standard position tan0 tan2 tangent curve terminal side trigonometric equations trigonometric form trigonometric functions trigonometric ratios vector velocity waves Write