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" In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference. "
An Easy Introduction to the Mathematics: In which the Theory and Practice ... - Page 405
by Charles Butler - 1814
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Kent's Mechanical Engineers' Handbook, Volume 1

William Kent - Mechanical engineering - 1923 - 1450 pages
...triangle — Theorem 1. The sines of the angles are proportional to the opposite sides. Theorem 2. The sum of any two sides is to their difference as the tangent half the sum of the opposite angles is to the tangent of half their difference. Theorem 3. If from...
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Trigonometry for the Practical Man

James Edgar Thompson - Plane trigonometry - 1935 - 224 pages
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Introductory College Mathematics

William Edmund Milne, David Roy Davis - Mathematics - 1941 - 550 pages
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Practical Astronomy: A Textbook for Engineering Schools and a Manual of ...

George Leonard Hosmer, James Melvin Robbins - Spherical astronomy - 1948 - 404 pages
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Basic Mathematics for Engineering and Science

Walter Roe Van Voorhis - Engineering mathematics - 1952 - 670 pages
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A Thousand and One Questions on Crystallographic Problems

Pieter Terpstra - Crystallography - 1952 - 204 pages
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Handbook of Structural Design

Irvine Ernest Morris - Structural analysis (Engineering) - 1963 - 854 pages
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The Builder's Dictionary: Or, Gentleman and Architect's Companion; Being a ...

Architecture - 1981 - 560 pages
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ASM Handbook of Engineering Mathematics

American Society for Metals - Engineering mathematics - 1983 - 720 pages
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