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geometry - Locating the focus, vertex, and directrix of a conic when viewed as a plane section of a cone - Mathematics Stack Exchange
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Algebraic geometry; a new treatise on analytical conic sections . a hyperbola.TakeOA = lin., AN=2in., N(a=5in. CHAPTER XIII. POLAR EQUATION OF A CONIC SECTION. 298. If the focus of a conic
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