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" A'B'C', and applying the law of cosines, we have cos a' = cos b' cos c' + sin b' sin c' cos A'. Remembering the relations a' = 180° -A, b' = 180° - B, etc. (this expression becomes cos A = — cos B cos C + sin B sin C cos a. "
Elements of Geometry and Trigonometry from the Works of A.M. Legendre ... - Page 323
by Charles Davies - 1854 - 432 pages
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Traité de géométrie analytique précédé des éléments de la trigonométrie ...

A. Boset - Geometry, Analytic - 1881 - 730 pages
...B cos c. On peut trouver immédiatement ces formules au moyen des triangles polaires en parlant de cos a = cos b cos c -+- sin b sin c cos A. Soit A' B' C' le triangle sphcrique polaire de ABC, a', b', c' étant les côtés de ce triangle polaire....
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Leçons de trigonométrie: conformes aux programmes de l'enseignement ...

Briot (M., Charles), Jean-Claude Bouquet - Trigonometry - 1881 - 264 pages
...sin A "" sin B " " sin C ' quand R augmente indéfiniment, deviennent sin A sin B sin C ' La formule cos a = cos b cos c + sin b sin c cos A, quand on y remplace cos a par 1 — 2 sin* -=- et de même cos 6 et cos c, s'écrit ab . c bel sin*...
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Elements of Plane and Spherical Trigonometry with Logarithmic and ..., Volume 1

Simon Newcomb - Logarithms - 1882 - 188 pages
...the fundamental equations of spherical trigonometry, because by means of them, when three parts are cos a = cos b cos c + sin b sin c cos A ; •] cos b — cos c cos a -|~ sin c sin a cos 2?} > (1) given, the other three may be found. For practical application...
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Briefwechsel

Carl Friedrich Gauß - 634 pages
...findet : tang B2 + tang C2 — 2 tang /, tang C cos a = sec B2 + scc C2 — 2 sec R scc C cos A oder cos A = cos B cos C -\- sin B sin C cos a usw Hieraus leitete ich , dadurch dass ich aus diesen Gleichungen sin a, sin b, sin e bestimmte, sin...
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The Cambridge History of Islam: Volume 2B, Islamic Society and Civilisation

P. M. Holt, Ann K. S. Lambton, Bernard Lewis - History - 1977 - 582 pages
...(uniting the three sides and one angle of a spherical triangle) which has no equivalent in Ptolemy: cos a = cos b cos c — sin b sin c cos A A further advance was made with Abu'1-Wafa', and he was probably the first to demonstrate the sine...
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Astronomie de position, géodésie

André Caillemer, Catherine Le Cocq - Geodesy - 1983 - 272 pages
...tirer d'affaire en toutes circonstances, sans le secours d'imprimés qui risquent de faire défaut cos a = cos b cos c + sin b sin c cos A et : sin a sin b sin A sin B sin C Dans le triangle de position ces formules donnent : cos z = sin...
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Robot Vision

Berthold Horn - Computers - 1986 - 530 pages
...for the sides is cos a = cos 6 cos c + sin 6 sin c cos A, while the law of cosines for the angles is cos A = - cos B cos C + sin B sin C cos a. There are two more formulae in each case obtained by simultaneous cyclical permutation of a, 6, c and...
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Mathematical Modelling

Jagat Narain Kapur - Mathematics - 1988 - 276 pages
...triangles are given by sin A sin B sin С .... —. = — — г = — : (25) sin a sin b sin c and cos a = cos b cos c + sin b sin c cos A (26) The point vertically above the observer is called his zenith and is denoted by Z. Thus OZ gives...
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Engineering Mathematics and Statistics: Pocket Handbook

Nicholas P. Cheremisinoff, Louise Ferrante - Mathematics - 1989 - 224 pages
...spherical triangle and A, B, C represent the corresponding opposite angles Law of Cosines for Sides cos a = cos b cos c + sin b sin c cos A cos b = cos c cos a + sin c sin a cos B cos c = cos a cos b + sin a sin b cos C Law of Tangents tan '/2(fl - C)...
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Differential Geometry

J. J. Stoker - Mathematics - 1989 - 432 pages
...triangle T**. The "law of cosines " for triangles in each of the three geometries of constant curvature is cos a = cos b cos c + sin b sin c cos a (K* > 0), a* = b* + c2 - 2bc cos a (K* = 0), cosh a = cosh 6 cosh c — sinh b sinh c cos a (K* < 0)....
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