Analytic geometry for colleges, universities, and technical schools (1892)
Nichols, E. W. (Edward West), 1858- · Boston [Mass.] : Leach, Shewell & Sanborn · leaf 265
= 0 I • • • (^) cos « cos « + cos y8 COS y8 + cos 7 cos 7 = 0 J Hence, in this case, only three of the nine angles involvedin equation (1) are independent. 250 SOLID ANALYTIC GEOMETRY. THE CONIC SECTIONS. 191. The Conic Sections, or, more simply, The Conics,are the curves cut from the surface of a… … Fig. 84. Let CAEAC be the conic surface, generated by revolvingthe element CA about OZ as an axis. Let P be any point onany element as CE; let OC = c and OEC = 6. Draw DP || to XY-plane and intersecting OZ in D; drawPK II to OZ, KB II to OY, and join 0 and K producing it tomeet the base circle in…
Geometry, Analytic
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-357-249.webp)
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