Elements of analytical geometry and of the differential and integral calculus (1866)
Davies, Charles, 1798-1876 · New York, Barnes & Co. · leaf 97
Ae- e^x = e{A - ex).Hence, FJ^ : FN : : A + ex : A- ex. By referring to the values of r and r (Art. 3, Equations(8) and (9), and recollectmg that -j = e, we have, r : r : : A -{- ex : A — €x\hence, r : r : : F2T : FN; therefore, FN bisects the angle FFF,* Tangent line and lines to the focL 19. Let… … BOOK III.] THE ELLIPSE. 97
Geometry, Analytic · Calculus
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