Analytic geometry and principles of algebra (1913)
Ziwet, Alexander, 1853-1928, Hopkins, Louis Allen, joint author, Hedrick, E. R. (Earle Raymond), 1876-1943 · New York, The Macmillan Company · leaf 197
la according as2/^ — 4 ax is less than, equal to, or greater than zero. Similarly, the slope-form (12) of the normal shows that notmore them three normals can be drawn from any pmnt of theplane to the parabola, since the equation (12) is a cubic for nwhen the coordinates of any point of the plane… … Fig. 71 192. Geometric Properties. Let the tangent and normalat P (Fig. 71) meet the axis at T, N,, let Q be the foot of theperpendicular from P tothe axis, D that of the per-pendicular to the directrixd; and let 0 be the vertex,F the focus. As the subtangent TQ isbisected by 0 (§ 186) andthe…
Geometry, Analytic
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
