Analytic geometry, for technical schools and colleges (1897)
Lambert, Preston Albert, 1862-1925 · New York, Macmillan · leaf 154
nse-quently when ac — &- > 0 equation (1) represents an ellipsewhen interpreted in oblique coordinates. In like manner itfollows that equation (1) interpreted in oblique coordinatesrepresents an hyperbola when ac — Z^- < 0, a parabola whenac - 62 = 0. Problems. — 1. Two vertices of a… … 140 ANALYTIC GEOMETRY Substituting in sin^ d + cos- ^ = 1, there results af _ 2 sin (a - ;3 + co) _^ tf ^ sin-^ (a + ^ - w)^a^ ah Ir sin- w
Geometry, Analytic
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