Bailey, Frederick H. (Frederick Harold), 1865- · Boston, London, Ginn & Co. · leaf 182
FlO. 72. case we may draw for the ellipse either one of Figs. 73 and 74,and similar figures for the parabola and the hyperbola. … Fig. 73. Take any secant PiN intersecting the conic at N and M,and let (xa, y^) and (xs, ys) be the unknown coordinates of Nand M. The equations of the tangents at N and M are,respectively, by [34], § 76, Ax.,x + By,y + G (x + x,) + F (y + y,) + C = 0, (1) Ax,x + By,y + G (x + X3) + F (y + y,) + C…
Geometry, Analytic
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