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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... "
Spherical Trigonometry: For the Use of Colleges and Schools - Page 15
by Isaac Todhunter - 1863 - 132 pages
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Spherical Trigonometry, for the Use of Colleges and Schools: With Numerous ...

Isaac Todhunter - Spherical trigonometry - 1878 - 178 pages
...cos c' + sin b sin c' cos B'AC \ buta' = w — a, c' = ir — c, B'AO = ir — A; thus cos a = cos 5 cos c + sin b sin c cos A. (2) Suppose both the sides...the angle A to bo greater than quadrants. Produce AB and AC to meet at A' ; put A'B=c', A'C = b'; then from the triangle A' BO, as before, cos a - cos...
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Spherical Trigonometry, for the Use of Colleges and Schools: With Numerous ...

Isaac Todhunter - Spherical trigonometry - 1879 - 176 pages
...quadrants. Produce AB and AC to meet at A' ; put = c', A'C = V; then from the triangle ABC, as before, cos a = cos b' cos c' + sin b' sin c' cos A'; but b'-тг — b, c' = тг-c, A' — A; thus cos a = cos 6 cos с + sin 6 sin с cos A. TST (3) Suppose...
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Lehrbuch der elementaren Mathematik

Victor Schlegel - Arithmetic - 1878 - 768 pages
...3) «nb = — -r— — ; 4) sm a sin a Aufgabe 3. — Gegeben bc«. Wenn man in der Formel 336 (a) cos a = cos b . cos c + sin b . sin c . cos a die Substitution macht: (b) cos a — cot b . co< y, so erhält man cos a = cos b (co* C + sin C ....
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The Elements of Plane Trigonometry

Henry Nathan Wheeler - Plane trigonometry - 1878 - 198 pages
...the triangle A'B'C' we get cos a' = cos b' cos d + sin V sin d cos A', or substituting from above — cos A = (— cos B) (— cos C) + sin B sin C (— cos a) ; or — cos A = cos B cos C — sin B sin C cos a, ) and similarly I r-*r>-, ™ T. ri -ni COS ^ —...
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A Treatise on Special Or Elementary Geometry: Including an Elementary, and ...

Edward Olney - Geometry - 1879 - 502 pages
...plus the product of the sines of those sides into the cosine of their included angle ; that is, (1) cos a = cos b cos c + sin b sin c cos A ; (2) cos b = cos a cos c + sin a sin c cos B ; > A, (3) cos c = cos a cos b + sin a sin b cos C. DEM.—...
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Kurze anleitung zum rechnen mit den (Hamilton'schen) quaternionen

Johann Odstrčil - Quaternions - 1879 - 96 pages
...— cos a, so erhält man eine andere Form der Fundamentalgleichung der sphärischen Trigonometrie cos A + cos B cos C — sin B sin C cos a. 28. Nimmt man dagegen die Vectortheile, so hat man « sin A = y cos B sin C + /3 cos 6' sin $ + F/37...
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Geodesy

Alexander Ross Clarke - Geodesy - 1880 - 390 pages
...put T\ e2 cos2 <£ = i : then on equating these values of BC2, we get after a slight reduction, 0 = 2 (cos a — cos b cos c— sin b sin c cos A') where H= 4bccoaA'—3c2-b2 = —a2- 2 accost, K- 4bccosA'—3b*—c2 = -a2 — 2at>cos C. Now put for...
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Briefwechsel zwischen Gauss und Bessel

Carl Friedrich Gauss, Friedrich Wilhelm Bessel - Astronomy - 1880 - 644 pages
...findet : tang ß2 + tang C* — 2 tang B tang C cos a = sec /?z + sec C2 — 2 sec B sec 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 «, sin 6, sin c bestimmte, sin...
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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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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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