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" B . sin c = sin b . sin C cos a = cos b . cos c + sin b . sin c cos b = cos a . cos c + sin a . sin c cos A cos B cos c = cos a . cos b + sin a . sin b . cos C ..2), cotg b . sin c = cos G. "
Higher Geometry and Trigonometry: Being the Third Part of a Series on ... - Page 138
by Nathan Scholfield - 1845 - 232 pages
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Traite Elementaire De Trigonometrie Rectiligne Et Spherique Et D'Application ...

Silvestre François Lacroix - Geometry, Analytic - 1852 - 354 pages
...qui sont : cos A = — cos B cos C + sin B sin C cos a cos B = — cos A cos C -f- sin A sin C cos b cos C = — cos A cos B + sin A sin B cos c cos A -+- cos B cos C cos b = cos c = sin B sin C cos B -+- cos A cos C sin A sin C cos C -+- cos A...
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Encyclopédie moderne: Dictionnaire abrégé des sciences, des ..., Volume 16

Encyclopedias and dictionaries - 1852 - 446 pages
...les côlés a', b', c, du triangle sphérique semblable tracé à sa surface , donnent l'équation cos c'= cos a' cos b' + sin a' sin b' cos C ; mais les arcs semblables a et a' donnent, en développant , R étant le rayon de la terre. Il faut...
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Elements de géométrie et de trigonométrie, á l'usage des candidats aux ...

M. E. Gouré - Geometry - 1852 - 644 pages
...donc facilement les deux angles A et B. Pour trouver le côté c, on se servira de la formule (n° 75) cos c = cos a cos b -+- sin a sin b cos C. Mais , pour rendre cette expression calculable par logarithmes, il faudra poser sin b cosC — : -,...
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Elementary Treatise on Astronomy

William Augustus Norton - Astronomy - 1852 - 522 pages
...a sin b sin c or, the sines of the angles are proportional to the sines of the opposite sides. 74. cos c = cos a cos b + sin a sin b cos C 75. cos c = cos (a — b) — 2 sin a sin b sin" £C 76. cos C = sin A sin B cos c — cos A cos B...
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A Treatise on Plane and Spherical Trigonometry

William Chauvenet - Trigonometry - 1855 - 264 pages
...is equal to the sine of the other angle. In PL Trig, we have sin A = cos JB. 48. From (4), we have, cos c = cos a cos b + sin a sin b cos C or, when (7=90°, cos c = cos a cos 6 (84) that is, the cosine of the hypotenuse is equal to the product...
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A Treatise on Plane and Spherical Trigonometry, and on Trigonometrical ...

John Hymers - Logarithms - 1858 - 292 pages
...opposite the greater angle. 45. If it be required to determine C independently of a and I, we have cos C= — cos A cos B + sin A sin B cos c = cos A (— cos B + swB tan .4 cos c) ; and determining the subsidiary angle $ by the equation cot...
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Spherical Trigonometry ...

Isaac Todhunter - Spherical trigonometry - 1859 - 156 pages
...free from ambiguity. Or we may determine C without previously determining a and b from the formula cos C = — cos A cos B + sin A sin B cos c. This formula may be adapted to logarithms, thus ; cos C = cos B (— cos A + sin A tan B cos c) ; assume...
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Compendium der höheren Mathematik. 3e, sehr vermehrte und verbesserte Aufl

Adam ritter von Burg - 1859 - 708 pages
...Polardrcieekes folgen). Fflr das obige Dreieck erhalt man auf diese Weise qp =• 22" 6' 30"'93. oder wegen cos c = cos a cos b -}- sin a sin b cos C (aus §. 66) auch : cos a — cos b cos c = cos a ( l — cos &2) — sin a sin b cos b cos C, also...
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Sitzungsberichte der Königl. Böhmischen Gesellschaft der Wissenschaften in Prag

Science - 1876 - 760 pages
...und (14) sin a sin b cos C '— — cos a cos b ~\- cos c , oder wie gewöhnlich geschrieben wird ' cos c ±: cos a cos b -\- sin a sin b cos C, was die erst e Qrundformel der sphärischen Trigonometrie fepräsentirt. Ebenso erhält man, wenn gesetzt...
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Berichte über die Verhandlungen der Königlich Sächsischen Gesellschaft der ...

Mathematics - 1860 - 564 pages
...daher zwei einander zu 360° ergänzende Werlhe. Andererseits wird c aus u, b und C durch die Formel cos c= cos a cos b-+- sin a sin b cos C gefunden, wonach dem durch seinen Cosinus bestimmten Bogen c ebenfalls zwei Werthe zukommen, deren...
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