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 269
hQ a parcdlel to the tangent, through D a parallel to the diameter;the locus of the point of intersection P of these parallels iscalled the versiera (wrongly called the witch of Agnesi). 256 PLANE ANALYTIC GEO.METRY [XII, § 269 We have evidently with 0 as origin and 00 as axis Ox X = a cos- <^,… … which reduces to the versiera for b = a. Sketch the versiera, and the last curve for b = \a Fig. 110 270. Cassinian Ovals. Lemniscate. Two fixed points F^,F2 being given it is known that the locus of a point P is :
Geometry, Analytic
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