Analytic geometry, for technical schools and colleges (1897)
Lambert, Preston Albert, 1862-1925 · New York, Macmillan · leaf 129
114 ANALVriC GEOMETRY the parabola — Calling the intercepts of the tangent on the 1ft) 2 7 2 X-axis X, on the F-axis Y, for the ellipse X = —, Y=—, forthe hyperbola X = ^, Y= , for the parabola X — — Xo, y= i_?/||. X and y may in each case be determined geometri-cally, and the tangent drawn as… … Suppose the point (,<■„ ?/,) to be any point in the plane of theellipse -T, + •— = 1. Let {x, y), (x, y) be the points of con-tact of tangents from (a-j, y{) to the ellipse. Then must (xi, y^) ... , „ , ,. xx ?/?/ . xx ?/w ^ ,, , . ,, he m each of the hues -^ -f ^4- = 1, -^ + ^ — 15 that is,…
Geometry, Analytic
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