Excerpt from Syllabus of Elementary Geometrical Conics<br/><br/>If the tangent at P meets the directrix in Z, psz is a right angle, and the tangent at P bisects the angle between the focal distance SP and the perpendicular PM on the directrix: and the tangent at the vertex is at right angles to the axis....
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HRD. Condition: New. New Book. Shipped from UK. Established seller since 2000. Seller Inventory # LX-9780260203984
Quantity: 15 available