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" A cos 6 = cos a cos c + sin a sin c cos B cos c = cos a cos 6 + sin a sin 6 cos C Law of Cosines for Angles cos A = — cos B... "
A Treatise on Plane and Spherical Trigonometry - Page 151
by William Chauvenet - 1856 - 256 pages
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Briefwechsel zwischen C.F. Gauss und H.C. Schumacher, herausg ..., Volumes 3-4

Carl Friedrich Gauss - 1861 - 952 pages
...völlig eben so gut siod. Sie mögen z. B. eben so gerne die vierte Fundamentalformel so schreiben cos A + cos B cos C = sin B sin C cos a Dergleichen gehört zu den vollkommen indifferenten Dingen, womit jeder es halten mug, wie er Lust...
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Elements of Geometry and Trigonometry: With Practical Applications

Benjamin Greenleaf - Geometry - 1862 - 518 pages
...plus the cosine of the second side into the cosine of the included angle. By (150) and (152) we have cos a = cos b cos c -\- sin b sin c cos A, cos c = cos a cos b -\- sin a sin b cos C; and by means of (147), sin C sin c = sin a --. — -.. sin...
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Zeitschrift für Mathematik und Physik, Volume 7

Mathematics - 1862 - 600 pages
...seinen Nebenwinkel ansehen, so erhalten wir für das Dreieck auf der Kugel sofort die Beziehungen: I. cos a =. cos b cos c -|- sin b sin c cos a , II. sin a sin ß = sin b sin a , III. cot a sin b — — cos b cos y + si>» y cot a , denen als...
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Military Schools and Courses of Instruction in the Science and Art of War ...

Henry Barnard - Military education - 1862 - 410 pages
...cot. a sin. i — cot. A sin. C = cos. i cos. C, and by the consideration ofthe supplementary triangle cos. A = — cos. B cos. C + sin. B sin. C cos. a. Right-angled triangles.—Formulas cos. a=cos. i cos. c; sin. J = sin.'a sin. B; tang. c—tang, a...
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Elemente der Vermessungskunde

Carl Maximilian von Bauernfeind, Karl Maximilian von Bauernfeind - Scientific apparatus and instruments - 1862 - 876 pages
...Zur Lösung der vorliegenden Aufgabe dient die bekannte Grundformel der sphärischen Trigonometrie : cos a = cos b cos c + sin b sin c cos A , in welcher A = w' , a = w und b = c = 90° — i zu setzen ist. Hiernach erhält man zunächst cos...
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Elements of Plane and Spherical Trigonometry: With Practical Applications

Benjamin Greenleaf - Geometry - 1862 - 532 pages
...Applying (150) to A' BC', we have cos a1 = cos b1 cos c' -j- sin b' sin c' cos A' ; or, by (46), — cos A =. cos B cos C — sin B sin C cos a ; whence, cos A = sin B sin C cos a — cos B cos C. (153) In like manner may be deduced cos -Z?=sin...
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Zeitschrift für Mathematik und Physik, Volume 7

Mathematics - 1862 - 586 pages
...seinen Nebenwinkel ansehen, so erhalten wir für das Dreieck auf der Kugel sofort die Beziehungen : I. cos a = cos b cos c + sin b sin c cos a , II. sin a sin ß = sin b sin a , III. cot a sin b = — cos 6 cos y + sin y cot et, denen als duale...
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Popular and Mathematical Astronomy, with the principal formulæ of Plane and ...

William Thomas Read - 1862 - 144 pages
...2 OP . OE, OD . OD PD . DE . c0sa = op7oE + pcrroE-cosA = cos b . cos c + sin b . sin c cos A ; and cos a — cos b . cos c = sin b . sin c cos A. Therefore f*>»«-«»ft•«>•« = cos A. sin b . sin c NB — Compare this with the value of cos...
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Mémoires couronnés et autres mémoires publiés par l'Académie ..., Volume 15

Académie royale des sciences, des lettres et des beaux-arts de Belgique - Science - 1863 - 702 pages
...on représente par A, B, C les angles et par «, 6, B c les côtés opposés, la formule générale cos A = — cos B cos C + sin B . sin C . cos a , où l'on doit poser C = 90°, donne cos A = sin B . cos «. On a, d'ailleurs, r cos a — — > sin...
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Spherical Trigonometry: For the Use of Colleges and Schools

Isaac Todhunter - Spherical trigonometry - 1863 - 182 pages
...base and A the opposite angle of one triangle, arid a and A' similar quantities for the other. Then cos a = cos b cos c + sin b sin c cos A, cos a' = cos b cos c + sin b sin c cos A'; therefore cos a - cos a' = sin b sin c (cos A — cos A')...
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