Woods, Frederick S. (Frederick Shenstone), 1864-, Bailey, Frederick H. (Frederick Harold), 1865- · Boston, New York [etc.] Ginn and Company · leaf 143
pointthen being taken as the pole of the system of coordinates.This use is illustrated in the following examples: Ex. 1. Prove that if a secant is drawnthrough the focus of a conic, the sum of thereciprocals of the segments made by thefocus is constant. Let P1P2 (fig. 112) be any secant throughthe… … Hence I + I 1 — e cos (6 + 7r) 1 + e cos I2 Ex. 2. Find the locus of the middleof a circle all of which pass through a Take any circle with the center C(fig. 113), and let 0 be any point in theplane. If 0 is taken for the pole, and OCfor the initial line, of a system of polarcoordinates, the…
Geometry, Analytic · Calculus
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