 | Edward Olney - Geometry - 1872 - 566 pages
...upon the opposite side or side produced, the tangent of half the sum of the segments* of that side is to the tangent of half the sum of the other two sides, as the tangent of half the difference of those sides is to the tangent of half the difference of the... | |
 | Edward Olney - Trigonometry - 1872 - 216 pages
...upon the opposite side or side produced, the tangent of half the sum of the segments* of that side is to the tangent of half the sum of the other two sides, as the tangent of half the difference of those sides is to the tangent of half the difference of the... | |
 | Benjamin Greenleaf - Trigonometry - 1876 - 208 pages
...spherical triangle is to the cosine of half their difference as the cotangent of half the included (ingle is to the tangent of half the sum of the other two angles. The sine of half the sum of two sides of a spherical triangle is to the sine of half their... | |
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The cosine of half the sum of two sides of a spherical triangle is to the cosine of half their difference as the cotangent of half the included angle is to the tangent of half the sum of the other two angles. 
