Text Book of Military Topography: Including the Courses of Instruction at the Royal Military Academy ... Garrison Instruction, and Examinations for Promotion

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H.M. Stationery Office, 1883 - 226 pàgines
 

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Pàgina 142 - In the same way it may be proved that a : b : : sin. A : sin. B, and these two proportions may be written a : 6 : c : : sin. A : sin. B : sin. C. THEOREM III. t8. 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. By Theorem II. we have a : b : : sin. A : sin. B.

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