 | Isaac Todhunter - 1879 - 176 sivua
...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... | |
 | Victor Schlegel - 1878 - 768 sivua
...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 .... | |
 | Henry Nathan Wheeler - 1878 - 198 sivua
...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 ^ —... | |
 | Johann Odstrčil - 1879 - 96 sivua
...— 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... | |
 | Heinrich Behnke, F. Bachmann, K. Fladt - 1974 - 708 sivua
...cos y = —cos a cos ß + sin a sin /Î cos c, and similarly for the cosine theorems for the sides cos a = cos b cos c + sin b sin c cos a, cos A = cos c cos a + sin c sin a cos ß, cos c = cos a cos ¿> + sin a sin è cos y. It is now easy to... | |
 | Carl Friedrich Gauß - 634 sivua
...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... | |
 | P. M. Holt, Ann K. S. Lambton, Bernard Lewis - 1977 - 582 sivua
...(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... | |
 | André Caillemer, Catherine Le Cocq - 1983 - 272 sivua
...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... | |
 | Berthold Horn - 1986 - 530 sivua
...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... | |
 | Jagat Narain Kapur - 1988 - 276 sivua
...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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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... 
