 | Alfred Monroe Kenyon, Louis Ingold - Trigonometry - 1913 - 184 pages
...OP/ OR = cos c, PR/ OR = sin c, I. cos a = cos 6 cos c + sin 6 sin c cos A . 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 two sides into the cosine of their included angle. Compare this... | |
 | Alfred Monroe Kenyon, Louis Ingold - Trigonometry - 1913 - 300 pages
...PR / OJ? = sin c, I. cos a = cos 6 cos c + sin 6 sin c cos A. The cosine of any side of a spher<cal triangle 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. Compare this... | |
 | Maxime Bôcher, Harry Davis Gaylord - Trigonometry - 1914 - 170 pages
...clearing of fractions, we find (1) cos a = cos b cos c + sin b sin e cos A. 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 their sines into the cosine of the included angle. 49. Formulas for the Half-Angles.... | |
 | Claude Irwin Palmer, Charles Wilbur Leigh - Logarithms - 1916 - 348 pages
...and B. 122. Cosine theorem (Law of cosines). — In any spherical triangle, the cosine of any side is equal to the product of the cosines of the other two sides, increased by the product of the sines of these sides times the cosine of their included angle. Proof. Let ABC, Fig. 124, be a spherical... | |
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Spherical Triangle the cosine of any side is equal to the product of the cosines of the other two sides... 
