## Essentials of Plain and Spherical Trigonometry |

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### Contents

ANGLES COORDINATES TRIGONOMET | 1 |

FIRST APPLICATIONS | 20 |

LOGARITHMS AND SLIDE RULE | 45 |

Copyright | |

17 other sections not shown

### Common terms and phrases

altitude angle of elevation bearing called Chapter complex number coordinates corresponding cos2 cosB Cot Csc Sec course deﬁned deﬁnitions degrees departure dihedral angle equal equation Example Express exsec feet ﬁeld ﬁnd Find the angle Find the length Find the values ﬁrst quadrant angle ﬁve Formulas Computations given graph Hence identities indicated intersection inverse function isin latitude law of cosines law of sines law of tangents log ctn logarithms longitude method MISCELLANEOUS EXERCISE nautical miles negative oblique triangles obtained perpendicular plane polar form polar triangle pole positive prime meridian problem Prop quadratic equation radians right angle right spherical triangle right triangle roots scale second quadrant angle signiﬁcant ﬁgures sin2 slide rule Solution Solve the triangle spherical triangle spherical triangle ABC Substituting subtraction tan2 terminal side theorem tion traverse trigonometric functions vector vertex x-axis zero