Brodetsky, Selig, 1888-1954 · London, G. Bell and Sons, Ltd. · leaf 123
TRIGONOMETRICAL FUNCTIONS 105 We get by the method of § 58 : … There is no very obvious indication of most convenient values of a, ^. We therefore use ones giving least arithmetic; e.g. ^=0, a==— 1 as in d'Ocagne's nomogram for the quadratic equation. We get f__i ^+l_sm(p Hence 1+1 = -!!^*, ? 5
Nomography (Mathematics)
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