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Livres Livres 1 - 2 sur 2 pour As the sum of the two sides Is to their difference, So is the tan of half the sum....
" As the sum of the two sides Is to their difference, So is the tan of half the sum of the unknown angles To the tan of half the difference of the unknown angles. And this tan half difference added to the half sum of two unknown angles gives the greater... "
An introduction to plain trigonometry, with its application to heights and ... - Page 69
de Richard Cockrel - 1792 - 99 pages
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Practical military surveying and sketching

Alfred Wilks Drayson - 1861 - 192 pages
...find the other quantities we proceed as follows : — Suppose AB, BC, known, and the angle ABC. Then as the sum of the two sides Is to their difference, So is the tangent of half the sum of the two unknown angles To the tangent of half their difference. Half their...
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Study of Steam and the Marine Engine for Young Sea Officers in H.M. Navy ...

S. M. Saxby - 1862 - 179 pages
...rule for the finding of the unknown angles of a triangle when one is given. It is this. 60. EULE. — As the sum of the two sides Is to their difference, So is the tan of half the sum of the unknown angles To the tan of half the difference of the unknown angles....
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