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... Higher Geometry and Trigonometry: Being the Third Part of a Series on ...  Page 68 by Nathan Scholfield  1845  232 pages Full view 
