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Spherical Triangle the cosine of any side is equal to the product of the cosines of the other two sides, plus the product of the sines of those sides into the cosine of their included angle ; that is, (1) cos a = cos b...
Academic Trigonometry: Plane and Spherical - Page 25
by Thomas Marcus Blakslee - 1888 - 35 pages

## A Treatise on Special Or Elementary Geometry, Volumes 1-2

Edward Olney - Geometry - 1872 - 562 pages
...thought sufficient for the general student] 143. Prop. — In a Spherical Triangle the cosine of any side is equal to the product of the cosines of the other two sides, 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...

## Elements of Trigonometry, Plane and Spherical

Edward Olney - Trigonometry - 1872 - 216 pages
...sufficient for the general student.] 143. Prop. — In a Svherical Triangle the cosine of any side is equal to the product of the cosines of the other two sides, plus the product of the sines of those sides into the cosine of their included angle; that is, (1) cos a — cos b cos...

## A Treatise on Special Or Elementary Geometry

Edward Olney - Geometry - 1872 - 472 pages
...sufficient for the general student.] 143. Prop. — In a Spherical Triangle the cosine of any side is equal to the product of the cosines of the other two sides, plus the product of the sines of those sides into the cosine of their included angle ; that is, (1) cos a = cos b cos с...

## Surveying and Navigation, with a Preliminary Treatise on Trigonometry and ...

Aaron Schuyler - Measurement - 1873 - 508 pages
...C. (3) sin b : sin c : : sin B : sin C. 136. Proposition II. The co-sine of any side of a spherical triangle is equal to the product of the co-sines of the other sides, plus the product of their sines into the co-sine of their included angle. Let ABC be a spherical...

## Elements of Plane and Spherical Trigonometry: With Practical Applications

Benjamin Greenleaf - Trigonometry - 1876 - 204 pages
...still equal to the sine of G. 7» TRIGONOMETRY. 149. In any spherical triangle, the cosine of any side is equal to the product of the cosines of the other two sides, plus the product of the sines of those two sides into the cosine of their included angle. Let A В C be any spherical triangle,...

## A New Treatise on Surveying and Navigation, Theoretical and Practical: With ...

Horatio Nelson Robinson - Navigation - 1878 - 564 pages
...cot.BC Or, cot.J.tf : cot.BC = cos.ACD : cos.BCD. PROPOSITION VII. The cosine of any side of a spherical triangle is equal to the product of the cosines of the other two sides, plus the product of the sines of those sides multiplied by the cosine of the included angle. Let ABC be a spherical triangle,...

## The Elements of Plane and Spherical Trigonometry

Eugene Lamb Richards - Trigonometry - 1879 - 232 pages
...would equal C (Ch. 16, VIII.). 111. In a right-angled spherical triangle, the cosine of the hypotenuse is equal to the product of the cosines of the other two sides. LetJ.JJC'be a triangle rightangled at B, and on the surface of a sphere whose centre is O, the vertex...

## The Essentials of Plane and Spherical Trigonometry

Webster Wells - Trigonometry - 1887 - 200 pages
...sin a _ sin b _ sin c sin A sin В sin C 156. In any spherical triangle, the cosine of either side is equal to the product of the cosines of the other two sides, plus the continued product of their sines and the cosine of their included angle. In the right triangle BCD,...