The Formulae of Plane Trigonometry, printed with symbols (instead of words) to express the "Goniometrical Ratios". Oxford: James Wright for the University Press, 1861." /> DODGSON, Charles Lutwidge (1832-1898, "Lewis Carroll"). <I>The Formulae of Plane Trigonometry, printed with symbols (instead of words) to express the "Goniometrical Ratios"</I>. Oxford: James Wright for the University Press, 1861. | Christie's