Analytic geometry and principles of algebra (1913)
Ziwet, Alexander, 1853-1928, Hopkins, Louis Allen, Hedrick, E. R. (Earle Raymond), 1876-1943 · New York, The Macmillan Company · leaf 222
al on the axis Ox is there-fore ON=—x = e^x. From this result it appears by § 215 that (Fig. 91) F^N= c + e^ic = e(a -\-ex)=ze- F,P,F^N= c - e^a; = e(a -ex)=e F^P-, hence the normal divides the dis-tance F^Fi in the ratio of theadjacent sides F2P, F^P of thetriangle F.PF^. It follows thatthe normal… … Fig. 91 y = ±--yx^—a\a of the hyperbola (3) are b/a times the corresponding ordinates y = ± Va^ — a^ of the equilateral hyperbola (end of § 209) having the sametransverse axis. When 6 < a, we can put b/a = cos € and re-gard the general hyperbola as the projection of the equilateralhyperbola of…
Geometry, Analytic
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