| 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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